Quote:
Originally Posted by DuckieTigger
Occam's razor only leaves one answer as the most likely: the picture is legit, the devices have a different white balance without the warm leds turned on.
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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)
There are triple chip LEDs, that have red, green and blue leds and a diffuser. These make a more fake white, like CRT, big LED hall displays and plasma. The OLED displays don't use real LEDs, but electroluminescent diode amorphous printed "dots" often with phosphors to get the exact red, green and blue. Some use also yellow pixels. Some might use native colours. Some use a colour filter overlay like all full colour LCDs do
see
https://en.wikipedia.org/wiki/AMOLED and
https://en.wikipedia.org/wiki/OLED