LEDs produce light at discrete frequencies. A white bulb has a red, green and blue LED that is white-looking.
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Some LEDs use an RGB system but most use a phosphor that emits over a broad color spectrum. The typical white LED bulbs you find at the store are the phosphor type, not the RGB type.
“most use a phosphor that emits over a broad color spectrum”
Thanks for that information. I wasn’t aware of the use of phosphors. From Wikipedia:
“White LED lamps consist of a blue or ultra-violet emitter with a phosphor coating that emits at longer wavelengths, giving a full spectrum of visible light.”
And another quote:
“Since LEDs have slightly different emission patterns, the color balance may change depending on the angle of view, even if the RGB sources are in a single package, so RGB diodes are seldom used to produce white lighting.”
I still wonder whether a color TV actually produces all possible colors. It must have something to do with what our eyes are capable of seeing.