Nowadays the situation is better, but for years after incandescents were banned in California, the only LED bulbs available in stores had a huge spike in the blue part of the spectrum, which I experienced as painful and now know probably caused the death of some of the cones in my retina through oxidative stress.
(I am over 60 and have some health problems that chronically elevate my levels of oxidative stress -- in all cell types, though the light-detecting cells in the retina are more vulnerable than other types of cells are.)
I.e., I wanted to buy an LED that vaguely approximated a 2700K incandescent, tried many brands, but could not find one, so I don't know what you are on about.
Bright blue light will make a brain more alert -- and the effect is immediate. That is probably why you young people like it, but I am baffled by your "a color temperature of only 2700K is often chosen" (not that color temperature is a useful way of summarizing the spectrum of and LED bulb).
(I am over 60 and have some health problems that chronically elevate my levels of oxidative stress -- in all cell types, though the light-detecting cells in the retina are more vulnerable than other types of cells are.)
I.e., I wanted to buy an LED that vaguely approximated a 2700K incandescent, tried many brands, but could not find one, so I don't know what you are on about.
Bright blue light will make a brain more alert -- and the effect is immediate. That is probably why you young people like it, but I am baffled by your "a color temperature of only 2700K is often chosen" (not that color temperature is a useful way of summarizing the spectrum of and LED bulb).