Quote:
Originally Posted by oldtamiyaphile
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That's why "white" LED is often a misnomer.
Regardless, I oversimplified the facts surrounding white LEDs. There are 2 common ways to produce an LED that appears white.
The first involves combining red, green, and blue in the right amounts to trick the eye into thinking it is seeing white light. This is what TVs and computer monitors do.
The second most common method is to use a UV LED and a phosphorus coating. The phosphors convert the UV light into white light. A person might get orange and yellow out of this method of creating white light, but it's still wasteful to spend the energy to produce light in a broad spectrum, and then filter out all but a tiny slice of it. The usable light will still be too dim to be of any use.