Quote:
Originally Posted by Quoth
White LEDs don't exist. They are blue, violet or near UV LEDs with at least a yellow phosphor.
So indeed different batches might have a different shade due to phosphor used by LED maker, or different source of LEDs.
Warmth may be simulated by having native pure orange LEDs among the so called "white" LEDs as this is much cheaper than RGB LEDs (used on a few backlighted LCDs and some eink front lights)
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The white leds you are saying don't exist, because you want to call them blue with yellow phosphor, indeed have production variations even within the same production run. That is what sorting and matching is for if customer requirements are tight enough.
I would be interested to know which company and model uses rgb leds for their front lit eink devices. Unless you merely say it is possible, in theory.