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photon78s In fact, many modern light sources, such as LED lights, use a combination of incandescence and luminescence to produce light. Incandescent materials can provide the initial heat to activate luminescent materials, resulting in a more energy-efficient and versatile light source.
This physicsforum.com user's statement is pure nonsense, there is no such thing, luminescent light activated materials are not activated by heat, its nonsense. Phosphors that convert UV light (black light) into white like in LED's and the old CFL's are activated not by heat but by cold ultraviolet light. Only in those old white CFL fluorescent tubes a ballast was needed to provide a second long incandescent light for the mercury vapor to start being conductive for the high voltage that came afterwards, this generated UV light, and as this UV light shined on the white chalky phosphor coating around the glass tube, it produced phosphorescence, which is a type of luminescence. Which is the exact same principle used in WLED, except it does not use mercury vapor to produce UV light or needs a ballast to start up, now its just a purple diode with a phosphor coating, the amount of coating determines the kelvin temperature, "cool" or "warm", but the photons are still luminescent in nature.