Question

why do not tube lights (or fluirescent tube) generate heat?
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Answer 1

Answer:

because they have fillament made of mercury inside them

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Answer 2

The interaction of electricty and argon vapour along with a bit of mercury creates a plasma arc, and the arc radiates energy out of it, and the phosphors on the outside of the tube glow. The glow converts the electrical plasma energy into light , and heat, but not much.

Another type of tube light is a Vacuume Display device.

Both are deemed ‘cold ‘ devices since they do not get as ‘hot’ as incandescent bulbs do.