Blue-pump LEDs impair human color vision

Why we were too hasty in banning incandescent light bulbs

Deep within an office building where natural daylight does not penetrate, the only light came from ceiling mounted conventional blue-pump LED lights. These lights, which dominate our world today, provided a very artificial narrow spectrum with a sharp blue peak at 450 nm, and a second peak of green and yellow wavelengths to deliver the lux of visual bri…