Banned in the U.S: Healthy Light Bulbs
26th April 2024
“DOE believes at this time that circadian-friendly integrated LED lamps do not possess unique attributes compared to other (GSLs).” (i.e. light bulbs, which they refer to as general service lamps). (p. 28877)
This is nonsense. Circadian-friendly light bulbs have distinct spectral power distributions—i.e., the relative amounts of light at each color wavelength. Circadian-friendly lights are rich in 480 nm blue during the day and emit minimal 480 nm blue in the evenings and at night. This can easily be measured with a handheld spectrophotometer.
Evidence establishes that circadian-friendly lights should be less than 2 percent 440-495 nm blue in the evening and at night, and more than 20 percent 440-495 nm blue during the daytime.