Ive honestly wondered why people do not ask for or demand orange tinted lights? In the old times where we had sodium vapour lamps I was always under the impression that the orange wavelengths were specifically picked because our visual system is keenest under dusklike lighting conditions. Why then do we shift so much towards cold harsh lights? I dont think it's just the brightness that makes it unpleasant but also the wavelengths.

> In the old times where we had sodium vapour lamps I was always under the impression that the orange wavelengths were specifically picked because our visual system is keenest under dusklike lighting conditions.

The yellow from sodium vapor lamps was an artifact of the physics of the emission spectrum of excited sodium atoms.

The reason sodium vapor lamps were used was because before the advent of LED's, they were the most power efficient (lowest electrical energy consumption for a given light output). The 'yellow' light was just a byproduct of "more efficient bulb".