The issue - or perhaps, as we'll see, the benefit - of sodium vapor lamps, though, is that they put out a single, monochromatic color. Sodium emits light at around 590 nanometers, and thus sodium ...

What color are the street lights in your town? While an unfortunate few still suffer under one of the awful colors offered by vapor discharge lamps, like the pink or orange of sodium or the ...

Sodium-vapour lamps are not very popular these days as they give off primarily yellow light, inhibiting colour vision in the dark. They also contain mercury, making them potentially toxic if ...