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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