There is now substantial evidence that exposure to blue-rich light in the evening and at night increases the risk of obesity and diabetes. Most energy efficient LEDs in the market today are rich in the blue wavelengths that at night trigger the metabolic processes involved in obesity and diabetes through:
1) Disruption of the circadian system (phase shifting and circadian misalignment),
2) Melatonin-suppression and phase shifting,
Blue-rich light (including natural daylight) during the day is protective, but exposure to the same blue rich LED or fluorescent light during the night is harmful. To avoid this risk light fixtures need to provide blue-rich light during the day, and blue-depleted light at night. This paper presents the scientific evidence and the lighting solutions now available.
To read the entire whitepaper, click here.