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How does light affect our body?

A new map was created showing the areas most affected by artificial light pollution. The expert assesses the effects of this light on our mental and physical health.

A comprehensive map, called the Atlas of Artificial Light Brightness in the Night Sky, was published this month in Science Advances. The satellite atlas of the first atlas in 2001 was not as advanced as it is today. The new atlas therefore contains a much clearer image.

Atlas measures the “artificial sky glow an that is reflected in the atmosphere from the electric light on earth at night. This glow is caused by light pollution. And what is the extent of this pollution?

Italian scientist Fabio Falchi, head of the Atlas team, says that due to light pollution, one-third of people can no longer see the Milky Way galaxy, and the greatest loss is in industrialized areas. 60 percent of Europeans and 80 percent of North Americans cannot see the Milky Way galaxy at night.

But the problem with light pollution is not just about seeing stars. Falchi and his team say this pollution also has an impact on the environment and public health.

Where is the most intense light pollution?
The satellite makes measurements and travels on poles at an altitude of 800 km from the ground, taking pictures of Earth at night. The location and intensity of the light are determined. These measurements are then converted into color maps.

The brighter the sky on the map, the harder it is to see the stars at night. For example, you can see only a few stars in the night sky at Times Square in New York at best.

In the red spots on the map, it is not possible to see the night as it is due to light pollution.

Singapur Singapore is the most heavily polluted country. So much so that the eyes of the people here cannot use their ability to adapt to night vision, Fal says Falchi.

In major metropolises in Europe, America and Asia, the level of light on the streets prevents or delays our body from shifting to night-time as it should be.

Research on the effects of this is ongoing.

Electric light is widely used in developed countries. This causes a major change in the environment.

Light pollution isn't just a big city problem. For example, the light emitted from Las Vegas and Los Angeles also affects the Death Valley National Park.

Body clock
Like other living things on earth, people have a body clock, and this clock rhythmically regulates sleep and wake patterns, hunger, activity, hormone production, body temperature and many other psychological processes. This clock, which runs every 24 hours, depends on important signals such as daylight and darkness.

Perhaps the light pollution shown in the Atlas is not at a level that directly affects our body clock. This measurement is made by determining how much suppression of the hormone melatonin.

The light pollution measured by the Atlas is based on the reflection of the electric light in the atmosphere. These lights in our homes, workplaces and streets often have a disturbing effect on the body clock.

The shaping of the physiological structure according to the body clock was the result of billions of years of evolution. The introduction of electricity into people's lives has been in question since the end of the 19th century and the spread of electricity since the 20th century.

This time is a tiny drop in the ocean in terms of evolution. We do not know much about the effect of artificial light on the body clock.

Lately, doubts have arisen that disrupting the body clock causes problems such as sleep problems, obesity, diabetes, some cancers, and mood disorders. The most important factor that causes this is the electric light exposed at night.

What light?
Light pollution also causes some serious ecological problems, such as deaths in migratory birds and marine mammals.

The biological science of the technology that causes light pollution with the invention of the light bulb is investigating what kind of lights are more harmful to the body clock at what times of day.

Accordingly, a bright blue light with high blue content during the day (fluorescent), dim light with low blue content at night is recommended. It is also recommended to stay away from the bright blue screen tablets and smartphones in the evening.

The most important data to be revealed by these studies will be the application of the least harmful light in street lamps. In Los Angeles and New York, the fact that street lights have been completely transformed into a “white” LED light is highly criticized. This light contains the blue wavelength that most damages human beings in terms of body clock rhythm and night physiology.

You can read the original English version of this article on BBC Future.
Other articles in the journal can be found here.


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Meaning of White Color, Psychological Effects of White Color on Human

What does white mean, what does white mean? What are the psychological effects of white color on people? White color is undoubtedly known by everyone as the color of purity, cleanliness and goodness.

The meaning of white color and its effects on human psychology have been researched and compiled for you. The white color, which has become the symbol of cleanliness and purity, gives peace and confidence to people. Emotions and behaviors associated with white color can be summarized as follows: Perfection, Cleanliness, Goodness and Coldness
The white color is the opposite of black and reflects all wavelengths of the visible light spectrum. In Eastern cultures white color is associated with grief and death. In Western cultures, purity is associated with innocence and purification. security, spirituality and belief. Negative emotions with white; isolation in relationships, feeling of emptiness and inaccessibility.
MEANING AND EFFECTS OF WHITE COLOR
It symbolizes purity, cleanliness and innocence. In many cultures brides wear white. Plus cleaning icons. That's why doctors, nurses and laboratory technicians wear white to look sterile. White reflects light and keeps the environment cool. Therefore, it is the dress color of summer. It gives a generally cool and invigorating feeling.
People who love white are often people who love cleanliness, light and thinking, and whose imagination is wide, cool and conciliatory.



WHITE COLOR: SYMBOL OF PURITY AND CLEANING
The white color, which contains all colors, is the symbol of purity and cleanliness. It represents cold blood, nobility, innocence, stability and continuity. Gives peace and confidence. Increases the power of thought. There is also a side that gives people sadness and reminds them of their troubles and problems. Perhaps for this reason, it is believed that white is the mourning color in the Far East Asian countries and especially among the Chinese.
The effect of colors on spaces cannot be underestimated. The dominant colors on the walls and furniture of your living room in your home or in your workplace will significantly affect your perceptions and moods. For this reason, it is necessary to take these into consideration when choosing colors and choose colors that match the spirit of the space used.
Meaning of white: If we look in terms of spaces and perception, spaces painted in white color are perceived as wider and more spacious. Because of this effect, it can be a suitable choice especially for narrow spaces like bathrooms, kitchens and guest rooms. However, it can easily be used in other places as a complementary and balancing color that matches all colors. The white color reflecting light reflects the light received by low light spaces in the space and makes the space brighter.



Because it evokes cleanliness and health, the white color is used frequently in healthcare, especially in hospitals and pharmaceutical companies. In fact, almost all medicine boxes are white.
Those who prefer white color in their clothing are perceived by their environment as more stable, reliable and clean. It also makes you look younger than you are and is often more effective than makeup.
People who love white are often cold, cold-blooded and accommodating, whose imagination is broad, loving cleanliness, light and thinking.
Like every color, white color has various effects on human health. Research has shown that white color can be used in the treatment of lung and intestinal diseases and diabetes in particular. Source: Meaning of White Color, Psychological Effects of White Color on Human


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How does lighting affect mood?

You're probably reading this article in an indoor interior. For most people, modern living requires spending most of the day in indoor and artificial rooms.

However, while artificial light provides humanity with numerous possibilities, it also causes confusion in our bodies that have evolved for thousands of years to respond to the stimuli of daylight and night darkness. This response to natural light is called circadian rhythm or cycle and describes the 24-hour biological cycle of almost all living things. Circadian rhythm is mainly affected by light uptake, but temperature and other stimuli also play a role in this process.

Our natural clock is located in the part of the brain called the hypothalamus, which is linked to photoreceptors in the body (such as the retina). These receptors are responsible for synchronizing our internal clock with the light we absorb throughout the day. Understanding the circadian cycle is important because it affects the rhythms of the human body and affects sleep, mood, alertness, digestion, temperature control, and even cell regeneration. Research has shown that sufficient light increases mood and energy levels, while poor lighting contributes to depression and other body deficiencies. The amount and type of light directly affects concentration, appetite, mood and many other aspects of daily life.

But how can we have a healthy circadian rhythm if we spend most of our time in artificial light? Or the last thing we do before bedtime and the first thing we do when we wake up is to check our phones?
How can architects use lighting to promote a healthy circadian rhythm and, therefore, a healthier life? Researchers propose to simulate natural daylight cycles using artificial light. Brighter and stronger lighting is recommended in the morning and during the day, while dimmer lighting is recommended for the night. Conversely, configurations can lead to a confusing circadian rhythm that can alter our sleep patterns or reduce our energy throughout the day. A study at the University of Toronto shows that bright light “intensifies our initial emotional reactions to a stimulus” and “its effects can be both positive and negative, ışık pointing to the importance of light power.

The color temperature of the light also affects the human body. The higher the color temperature, usually shown as Kelvin (K), the brighter and cooler the light. In this case, “hot” and “cold” are not the physical heat of the lamp, but the tone or color of the light.

Warm light makes our environment feel warmer and more relaxing, while cold light makes the environment more stimulating, making us feel more focused, more focused, and improving our productivity. It is also believed that blue light reduces the level of melatonin, a sleep-related hormone, and makes us feel more alert. Because computers and mobile screens emit a lot of blue light, that last email check before bedtime makes our sleep less peaceful. When used wisely, however, blue light can be ideal in areas where the mind needs to work at full speed, such as meeting rooms, industrial kitchens and even high concentration factories.

The yellow tones at the bottom of the color scale correspond to the twilight and dawn times when the body is usually more relaxed. It makes sense if you think that until recently people were not exposed to high intensity lighting at night, only moon and fire light. Light, indirect and warm lighting tend to make environments quieter and more comfortable. While this is not a good choice for a work environment that requires productivity and productivity, it can be useful for a restaurant, relaxation area or bedroom.

Experts agree that the use of sunlight during the day and no direct exposure to cold or blue light at bedtime can improve sleep quality and positively affect a person's health and productivity. In addition, even though it is impossible to control the lighting of all the environments and spaces in which we are, it is important for us to re-evaluate some of the choices that we would make, otherwise without thinking, to be aware of the effects of the It can provide.


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Do colors really affect us physically and spiritually?

Color Professor responds…

“Red makes the heart beat faster,” and just like in this sentence, all colors are said to have physical and mental effects. But there is no scientific data to support them. We are beginning to understand the effects of colors on human psychology in this century.

For example, we know that the ear is the center of balance of the body and 2 basic functions of the eye. The retina in the back of the eye has light-sensitive cells known as cones, and this region sends an electrochemical signal to the brain area known as the visual cortex where the images we see are formed. We also know that some retinal ganglion cells react to light by sending signals to the hypothalamus - the central brain region - which do not produce visual images.

Not Vision, Light

The hypothalamus is an important part of the brain that controls the body's self-regulated aspects, including temperature, sleep, hunger, and circadian rhythms. If we are exposed to light in the morning - especially the blue / green light - this causes the release of the hormone cortisol that stimulates and arouses us and also prevents the release of melatonin. Late in the night when the amount of blue light in the sunlight diminishes, melatonin enters the bloodstream and makes this person lethargic.

Retinal cells that do not form an image between the eye and the hypothalamus are selective to the short wavelengths of the visible spectrum in blue and green. In fact, this clearly means; our physical and mental state is clearly influenced by colors.

Research says that exposure to bright lights of short wavelength before going to bed, in other words, the use of phones and tablets negatively affects sleep quality. Sleep quality is rapidly decreasing in modern society and this problem brings along diseases such as heart diseases, diabetes and obesity. The side effects of blue / green light are often measured, but more research is needed to know the effects of other colored lights.

Experiencing Colors

Professor Dr. Stephen Westland leads the Experience Design research group at the University of Leeds. The lighting laboratory was specifically designed to evaluate the effects of light on human behavior and psychology. In the UK the lighting system is unique, we can emit colored light at any wavelength in a room. Recent research shows that colored light has a small effect on heart rate and blood pressure. Namely; red light increases heart rate, blue light lowers. The impact is small, we know it, but this finding was confirmed in a report published in 2015 by a group of similar studies in Australia.

In 2009, blue lights were placed at the end of the platforms on Tokyo's Yamanote railway line to reduce suicide. The success of these lights (suicides decreased by 74% at stations where blue lights were installed) resulted in similar colored lighting on Gatwick Airport train platforms. All this effort was based on the claim that blue light could make people calmer, but there is little scientific evidence to support these claims: a three-year study by doctoral researcher Nicholas Ciccone in the group confirms that we still do not have valid and sufficient information about the effect of colored lighting. Similar studies continue in the lab to explore the effects of colors on creativity, students' classroom learning and sleep quality.

The discovery of the visual path that does not create an image has accelerated the researches on how we respond physiologically and psychologically to the colors around us. The use of colored lighting, which has increased as a result of advances in LED technology, has led to rigorous research in this area.


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Color Theory, 5 Colors for Understanding Colors and Easy Color Selection

Most of the people match the colors according to the intuitions that they developed as a child. Colors are one of the most important elements of a professional design. Because each color affects the balance of other components, the wrong color selection can trigger an emotion that you do not want to appear in your audience.
Choosing the right color combination can sometimes be challenging. In this article (video), I'll share 5 tips on how to choose the right colors for design, but let's make the introduction with color theory.

Color Theory
Color theory, which plays a vital role in design, has been used by artists and designers for decades. Do not be intimidated by the word theory, the basic color theory is an information that anyone can easily learn and apply.
Above all, you can use it in every area of ​​your life, not only for design, but also for creating the perfect combinations of clothes, decorating a room in your home or choosing the most harmonious colors in Instagram roller blinds. A good understanding of color theory will be of great help in discovering the magical world of colors.
Primary Colors
As you can remember from school, all colors come from a mixture of red, yellow and blue, the primary colors.

Secondary Colors
When primary colors are mixed together, secondary colors appear.
So, from red and yellow to orange
Yellow and green from blue
Purple emerges from a mixture of blue and red

Tertiary Colors
When six secondary colors blend and tertiary colors emerge, your color world will expand and ultimately you will have a color circle.

Color Circle
Throughout history, civilizations have developed color theories to define the world around them and to understand how we see colors. However, for the first time, Aristotle's ideas attracted more attention among color theorists and influenced subsequent theories.

The main foundations of color science were laid in the 17th century by lsaac Newton's glass prism experiments.
Newton experimented with glass prism and laid the foundations of color science, and saw that each color had different wavelengths as it passed through the prism.

In addition, Newton obtained white light by mixing all colors in the light.
The first color diagram was also developed by Newton by placing all colors on a circle with the white center.

Color Harmony
You may be wondering why information about colors is so important.
Music notes are used to write songs

Photo Credit: unsplash.com
colors are also the building blocks for pictures, designs and photographs.

Photo Credit: unsplash.com
Color harmonies help us find out which colors to blend to create the best combinations.
The idea of ​​color harmonies is based on the perfect balance of your combination with the right amount of contrast. The goal is to make a design that is not very modest but also balanced.
Analog Colors

One way to achieve a harmonious color harmony is to use similar colors, such as yellow, yellow-orange and clasps, or blue, navy and purple, which are adjacent to the color wheel.
Analogue colors are similar to each other, creating a calming and serene feeling. However, you can add black, white, or gray to your designs to create a balanced contrast so that your design doesn't put the audience to sleep.
Complementary Colors

Another way to achieve color harmony is to combine contrasting colors on the color circle, such as orange and blue, or complementary colors such as yellow and purple. Feel free to use complementary colors for maximum contrast, exciting and vibrant design. But be sure to use these colors evenly, otherwise your design may become incompatible.
Three Color Harmony

The three-color harmony is appropriately named because it consists of three colors arranged at equal intervals around the color circle; When the colors are connected by a straight line, they form a triangle.
Using the three colors in this chart, you can create a beautiful harmony and get a very harmonious result. But be sure to use one color more dominant and the remaining 2 colors less to achieve an acceptable balance. Movies are great resources if you want to improve your color skills. You can start with Wes Anderson.

Cross Complementary Colors

The diagonal complementary colors are slightly similar to normal complementary colors. In this combination, a primary color is selected and then the two colors opposite the color circle are used as complementary.
As opposed to the normal complementary colors, 2 harmonic colors are used, so I can say that this harmony is more suitable for softer and less risky designs.

Four Color Harmony

We can call the four color harmonies double complementary colors. It is the richest of all harmonies because it has two complementary colors, four colors.
The harmony of this harmony is somewhat difficult; If all four colors are used in equal amounts, the design may appear unstable, so it is useful to select only one color as dominant to make the colors dominant or passive.
Monochromatic Colors

Monochromatic colors consist of light and saturated shades of a single color. When used together, they fit well and create a clean and elegant effect in your design. Monochromatic colors look more beautiful to the eye, especially in blue, green and yellow tones.
You can use it to capture a general mood. The primary color can be integrated with neutral colors such as black, white or gray. However, when using this color harmony, it can be difficult to emphasize the most important elements in the design.

Image credit: freepik.com
Warm and Cold Colors
If you divide the color circle by a line in the middle, you will see warm colors on one side and cool colors on the other. Cool colors; calmness, peace and tranquility, vivid colors; use it to evoke a feeling of energy, vitality and excitement.

Warm Colors

Cool Colors

1- Choose the right color palette
When choosing the right color palette, consider your design target and audience. Choosing a color palette suitable for young people for an institutional audience or a specific sector can affect the design's message.
You have an unlimited choice of colors to choose from, just make sure you're taking the time and which color is right for your target audience.
There are many color palette websites that you can find on the Internet. Below you will find links to my favorite color palette websites.

2- Use Color Psychology
Did you notice that many technology brands have blue logos? Think of Facebook, IBM, Intel, Twitter and others that use this passive color to symbolize intelligence, freedom, trust, and progress.

Understanding color psychology will help you more easily reflect the emotions you want to convey in design and life.
For example, if you want the user to feel excited or energetic when browsing your website design, consider using bold colors such as red, yellow, or orange. Or you can try pastels or nature inspired blue and green colors for a calming effect.
3- Do not be afraid to use experimental colors
When Heinz released the green ketchup bottle, he sold more than 10 million bottles in the first seven months and reached the highest sales rate in the brand's history with $ 23 million in revenue.

It is a known fact that different colors can have very different effects on consumers. Be sure to try at least three options to help you find a powerful color palette that is most relevant to your brand.
4- Prepare mood board
To try different color palettes, I recommend creating a mood board consisting of pictures, photographs or color palettes of other brands.

Seeing how colors are used by other creators will give you ideas about the emotions your brand associates. Many designers rule 60–30–10 for the color palette except in special cases; that is, it will recommend that you select, for example, a color palette of 60% orange, 30% blue, and 10% green.

Creating a new brand image is an exciting process. Finding the right color palette can sometimes be difficult, but it can also be a lot of fun.
5- Everything is about balance
Colors can have a profound effect on the way the viewer perceives your designs.
Since choosing the right color palette will cover most of your work, start by asking yourself the following questions to understand the relationship between the colors you choose and create the right balance;
Is there enough contrast between them?
Is everything clearly defined?
What emotion does the color palette I choose trigger?
How does one color affect other colors?
Does the color palette match the content?
I hope this information I share with you will help you choose fascinating and impressive colors.


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6 psychological effects that shed light on the functioning of the brain

It is one of the most curious subjects of scientists, what causes the brain to do not only command our whole body but also responsible for our emotions. Once the great mystery behind even our daily activities is solved, we will have much more information on how to guide personal development.

Research has revealed six psychological effects that provide insight into brain functioning and decision-making. We have listed these 6 important impacts for you Uplifers readers.

Pratfall effect: The likelihood of being loved increases as we are not perfect.
Everyone makes mistakes, but it's not everyone's fee to accept them. However, being able to confess our mistakes and clumsiness and laughing at them makes us more at peace with ourselves while at the same time making us more lovable by others. The “perfect” person who has never caught a mistake creates an air of inaccessibility and a perception of distance.

This theory was tested by Elliot Aronson, a psychologist at the University of California. In his experiment, Aronson played the audio recordings of the people answering some questions to the volunteers and asked that these recordings be evaluated in terms of cuteness. As a result, the sound recordings of the people who knocked the coffee cup in front of them while answering the questions were perceived as the most sincere and therefore the most lovable.

Pygmalion effect: Prophecies perform itself.
The Pygmalion effect, also called the Etk Expectation Effect abilir, can be explained with the claim that gerçekleş if you believe, it will happen “. According to this theory, people behave in accordance with the expectations of people whom they consider superior to themselves. In other words, the idea of ​​achieving greater goals really gives the person the determination to achieve them.

The effect takes its name from an old mythological story. The prince of Cyprus, the sculptor Pygmalion, thinks that all women are flawed and tries to sculpt an ideal woman. This work, which he calls Galatea, is so beautiful that Pygmalion desperately falls in love with his work. The goddess prays to Venus and wishes Galatea to become a living being. Venus fulfills this wish and the couple live happily thereafter.

The first experiment on the Pygmalion effect was conducted by psychologist Robert Rosenthal and his team. In an elementary school, as a result of the assessment test at the beginning of the demolition of 1st and 2nd grade students, Rosenthal told the teachers that some students could achieve great academic success. These students were not the ones with the highest scores or the highest IQ in the test. At the end of the year, when the students were tested again, it turned out that the students, who Rosenthal randomly selected, convinced the teachers that they would be successful, really made the biggest progress. It seemed that the teachers had shown more support and attention to these students throughout the year thanks to the expectation effect.

The paradox of choice: The higher the options, the less likely we are to be satisfied with our choice.
Many researchers have long been trying to measure happiness, find out what makes people happy, and thus evaluate social development. When the freedom of choice is evaluated, it is a surprising result that freedom increases the rate of unhappiness. So much so that the more choices people have, the more they lose their ability to choose, and the less satisfied they have in the end.

Psychologists Mark Lepper and Sheena Iyengar tried this theory in a supermarket. They set up a trial stand with quality jams and offered people 6 choices at once and 24 choices at once. At the end of the experiment, it was seen that 30 percent of the people who received 6 options received jam, while only 3 percent of those who offered 24 options received jam.

Audience effect: In a crowded environment, the person seeking help can be ignored.
According to this impact, which can also be described as a complexity of responsibility, the possibility of helping a person in need of assistance or owning a job put forward in a meeting decreases as the environment gets crowded. Researchers attribute this to making people feel less responsible. This shows us that we need to be very clear, especially when delegating work to a group.

This effect was put forward by psychologists Bibb Latane and John Darley. Nearby, students who were in danger of suffocation due to obstruction of the trachea were observed. 85 percent of the students who think that there is no one else who can help, while 65 percent of the students who think that others can take this job tried to help the student whose breath is blocked. In fact, there are four other people who saw that only 31 percent of students extended their helping hand.

Spotlight effect: Our mistakes are not as noticeable as we fear.
It is called a “spotlight effect ına when a person thinks that they are paying more attention to their behavior or appearance than other people do. The same error is true of how many people have noticed our mistakes. In fact, others don't pay as much attention to our moments of small failure or clumsiness as we think.

In a study conducted at Cornell University a few years ago, the reactions of students who entered a crowded environment were measured with a T-shirt with a photograph of the American musician Barry Manilow, who was not popular at that time. Students who spent a while in the crowd told the researchers that at least half of the people noticed and commented on the T-shirt. However, even the quarter of the crowd did not show interest in these people and the t-shirts they wore.

Focusing effect: When we focus on one aspect of an event, we overlook other factors.
Is the emotion of a high salary the same as a low salary? Or can someone who lives in a sunny country spend the most of the year in a gray sky and in the rain? Research has shown that these people are equally happy about where they actually live; while answering the question revealed that they ignore other factors that affect happiness (low crime rate, distance from earthquake zone, etc.).

Looking at the issue from a distance while trying to make a decision helps us to gain perspective and see the big picture.


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The Effect of Lighting on Mood and Sleep

Future Designs consultant, sleep specialist The test, conducted by Neil Stanley, took place on a midsummer day to analyze the effects of light on the circadian rhythms of two volunteers and to record how different types of light affect human waking and sleep functions.

According to the results of an experiment, the power of lighting to influence mood, alertness and sleep under real-world conditions may seem limited as a result of different personalities and motivations.

Future Designs consultant, sleep specialist The test, conducted by Neil Stanley, took place on a midsummer day to analyze the effects of light on the circadian rhythms of two volunteers and to record how different types of light affect human waking and sleep functions.

Two separate areas were planned to be at the extremes of the Kelvin range (warm light against cold). One side was illuminated with 6000K cool white light and the other side with 2700K warm white light for an entire day and night.

Two different lighting tones were created with digitally controlled ceiling-to-wall panels. Two volunteers of the same age, height and weight worked and slept for 24 hours in the showcase of the Future Desings Technology Center in London. Those who came in front of the center were encouraged to read about the experiment called Light, Work, Sleep and observe the spaces.

Volunteers' memories, response times and attention during the working day created. It was regularly measured by Stanley and the volunteers were questioned about their mood and alertness. Cognitive functions were tested and evaluated the following morning.

Surprisingly, during the whole experiment, 2700K produced a lower level of drowsiness, while a 6000K “psychomotor attention task ((a timed response task that measures the response to a series of stimuli and requires the subject to be alert and alert to the appearance of the stimulus) has a negative response on stimulus response time. it seemed to have the effect.

The report, sponsored by the British lighting fixture manufacturer Future Desings, states that deney the reality that an experiment such as Light, Work, Sleep is being carried out in the showroom showcase has some limitations and it is not possible to control all variables at the clinical level ”.

Du Considering this, we should not put too much significance on the results of psychological tests, although the evaluations indicate that there are obvious differences between the two conditions in some tasks. ”

Despite the lack of test environment, it was understood that different lighting conditions could have a significant impact on performance, feelings of being alert, and in particular subjective mood.
The subject exposed to 6000K cold white light in the Light, Study, Sleep experiment felt less awake during the day, especially in the afternoon and evening. This result may be considered to be contrary to the theory that blue light has the power to produce wakefulness and improve performance.
This may be the case in an ideal environment under more “real-world” conditions, but as can be seen in this experiment, many other elements may also have an impact.

The researchers concluded that long-term exposure to 6000K of cold white light, especially in the afternoon and in the evening, can be tiring in itself, given the fact that it is counterproductive to natural changes in sunlight at that time. “In addition, exposure to sunlight can eliminate the relaxing effects of artificial 2700K warm white light reflected from above.

“Personality and motivation can play a big role. For example, a summer sunshine on a summer's day can lead some people to the mountains for a walk, while others can lie on the beach and lie down. Therefore 6000K cold white light has a paradoxical effect.

“People not only use light as zeitgeber, but we also react to other situations such as social interactions and food intake. Although we checked the timing of eating in our experiment, people's response to nutrition, for example, the pleasure of a pleasant meal compared to an ordinary meal, could play a role in their response to the situation.

“Perhaps this is the most important output of the Light, Work, Sleep experiment. The crucial element that contributes to the reactions of the volunteers is individual differences. Subjects were sex, age, structure, etc. In terms of equivalent, except light conditions, the differences between subjects' mood and sleep level will seriously affect the results. ken

“For example, when we look at the CSR raw scores instead of looking at the changes in the reference value, we can see that our volunteer in the 2700K warm white light was quite drowsy at the beginning of the study compared to our volunteer in the 6000K cold white light. Therefore, it gave less opportunity to change the sleepiness score under conditions thought to be more comforting. That is, the effect would have to be proportionally larger in order to realize a measurable change in its condition. This may also explain why it has changed less in the Line Analog Rating Scale measures associated with waking. ”

Sleep consultant Stanley concludes: beyaz Adjustable white light may have the power to lead to changes in wakefulness and performance, but this is only one of many factors that affect our daily lives. The relative contribution of light to the impact on daily performance and alertness needs to be clarified. ”


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