Q
How are LEDs different from other light sources in the way they produce light?
A
LEDs produce light by direct conversion of electrical energy to light energy.

On the other hand incandescent light sources produce light by heating a filament until it grows red hot. Linear and compact fluorescent lamps use a UV discharge plus a phosphor to produce the light. HID lamps use the ionization of gases in a discharge tube which in turn produce photons.

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