Because their heat generation is low and because they do not rely on a deteriorating material to generate light, LEDs have long operating lifetimes. One of the alternatives, incandescent bulbs, consume much more power, generate a great deal of heat, and rely on a filament that deteriorates in use.
Neon bulbs, on the other hand, rely on an excited plasma which, along with its electrodes, can deteriorate
over time.
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