Question

why the tube light is a cold source of light?​

Answer 1

Answer:

Cold means a lot of things. Tubes are called cold or warm depending on color balance. Speaking of temperature, the tube gets warm after running a while.

Answer 2

The fluorescent (tube light) is a cold source of light.” The light emitted from the fluorescence also contains some infrared (heat) energy because of the energy difference between the absorbed ultra-violet photon and resulting visible light emitted by the phosphor

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