White is the brightest color of LED’s. Every other color has some sort of filter that the light has to go through, and this filter takes away some of the brightness of the light that it emits.
“Blue LEDs are based on the wide band gap semiconductors of gallium nitride and indium gallium nitride. They can be added to existing red and green LEDs to produce the impression of white light, though white LEDs today rarely use this principle.” -http://en.wikipedia.org/wiki/Light-emitting_diode#Colors_and_materials
Blue and white colored LED lights are typically more expensive than others. This is due to their high intensity type of light, and high voltage. Blue has the forward voltage of about 4V.
The brightest LED color is white. This is because it contains all of the colors of rainbow/color wheel. A green or blue LED light is limited in its wavelength because it contains only one color. White LEDs are the brightest and that’s why LED lights in cars are white — also LED lights in houses are white for the same reason.
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