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What is the little glass tube in the middle of some lamp tubes?

April 26, 2017glass lamp little middle tube tubes

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What is the little glass tube in the middle of some lamp tubes?

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Answer 5. It is called “Cooling tube” in which excess mercury will be able to condense. Cooling tube helps to keep the mercury pressure at optimum level in a wide range of temperatures so that the lamp can give out stable lumen output.