How does a tube light work?
When the switch is turned on, an electric discharge begins in the starter.
The heat produced bends the bimetallic strip. Once the poles meet, the discharge automatically stops and the circuit closes.
When the bimetallic strip cools, it returns to its original position.
Meanwhile, the built up current is transferred to the poles of the tube, vaporizing the mercury droplets.
The mercury gas is then ionized by the current flowing within.
Why a tubelight produces white light?
The electricity causes tiny particles called electrons to travel at high speeds between the poles. These electrons hit the mercury gas producing ultraviolet radiation.
The glass tube is coated with a fluorescent material which charges it to white light.
And this is how the tube light works!
Watch this video with narration (background voice) :
https://www.youtube.com/watch?...
To learn how tube light works, read:
http://mocomi.com/how-does-a-t...
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