Exposure to blue light in the evening did not worsen the volunteers’ sleep or health. This was demonstrated by an experiment whose results were published in the journal. Nature Human Behavior.
A 2019 study on mice found that yellowish light had a stronger effect on the internal clock than bluish light. In the new study, scientists exposed 16 healthy people to light for an hour. They found no evidence that blue or yellow light plays a role in the functioning of the human internal clock.
The findings mean that it is more important to consider overall lighting when planning indoor lighting, with the color of the light playing a very minor role. But scientists have not examined the effects of longer exposure to blue light, such as when using a smartphone. It is possible that the results may be different under other experimental conditions.
Processes in the body are subject to circadian rhythms dependent on natural daylight hours. However, it is unclear which factor plays the main role in adjusting a person’s “internal clock”: the color of the illumination or the amount of light, since both parameters change with dusk and dawn. There is growing evidence that blue light from smartphones affects biological rhythms and sleep, so avoiding screen use in the evening or using night mode is recommended. On most devices, this will cause the screen image to appear yellowish.
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