Assertion: led | /r/HasProperty | cool
Facets:
Source sentences:
text: Unlike combustion or incandescent lamps, LEDs only operate if they are kept cool enough.
text: Whereas in most previous sources of light (incandescent lamps, discharge lamps, and those that burn combustible fuel, e.g. candles and oil lamps) the light results from heat, LEDs only operate if they are kept cool enough.