How do White LEDs work?
White LEDs work differently than the other colors because current white LEDs actually use a blue LED with a phosphor cap to produce white light. The phosphor converts some of the blue light into red/green which mixes with the blue to produce a white light. Getting this mix is a black art for the LED manufactures and there is currently quite a bit of variation from LED to LED. This also explains why a white LED has a blue cast to it.
