According to foreign media reports, researchers at the Korean Academy of Science and Technology (KAIST) recently said that research has proved that blue LED lighting can effectively help people overcome morning sleepiness. This research may bring about significant changes in lighting strategies in the future, and help to provide better indoor lighting environment.
Preliminary studies on light sources show that single blue fully saturated lighting can effectively stimulate physiological responses, but the relative effectiveness of commercial white light sources is not yet clear. In addition, the study focused more on the negative effects of blue light - for example, when people are exposed to blue light at night, it is difficult to achieve deep sleep because blue light inhibits the secretion of melatonin.
However, Professors Hyeon-Jeong Suk and Kyungah Choi of the KAIST Department of Industrial Design and their team believe that the effects of blue-rich morning light on physiological responses are time-dependent and have a positive impact on the subjective perception of melatonin levels, alertness, mood and visual comfort compared with warm white light.
The team conducted experiments on 15 College students. They investigated whether morning light of different colors, lasting for an hour, affected people's physiological and subjective responses. Compared with warm and white illumination, melatonin levels declined more sharply under the illumination rich in blue and white light.
"Lighting occupies most of our lives because we spend most of our time indoors," Suk explains. "Lighting is one of the most effective ways to influence our perception and experience changes in the environment around us."
Choi said: "By investigating all the psychological and physiological effects of lighting, we find that lighting for us is not just about efficient lighting quality. I believe that people-oriented lighting strategies can be applied to various environments, including residential areas, learning environments and workspaces, and improve our daily life.