Basically, LEDs are typically mono-chromatic, i.e. they generate light within a pretty tight range of wavelengths (what we perceive as color). There are two wa

Basically, LEDs are typically mono-chromatic, i.e. they generate light within a pretty tight range of wavelengths (what we perceive as color). There are two ways to get white light (which is light of "all" visible wavelengths) from a LED: combining a red, a green and a blue LED, or using a coating that when energized by (typically blue) light, in turn reacts and emits white light. You can read more at http://en.wikipedia.org/wiki/Light-emitting_diode#White_light http://en.wikipedia.org/wiki/Light-emitting_diode#White_ligh..., of course. Note: I'm just an (embedded) software guy with a hobby interest in electronics. :)