To know how much voltage a CCFL requires, you can use a cathode fluorescent lamp tester. Yep, you guessed it right. I will be teaching you how to use it the right way via this article obviously, but that is not it. Read till the end to benefit from it.
The tester applies its own rules, and we have to be careful about it because it is a high-voltage generator. So we have to follow a procedure to turn it on.
In that case, we have to set all the connections first and make sure everything is right before turning it on or powering it. It comes with two adapters; first, you have to remove them- either one of the outputs is okay.
This kind of tester is great for a laptop, lead screen, computer monitor, or TV; I am referring to cold cathode fluorescent lamps.
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I am going to use the TV with eight lamps for reference purposes; it will help you comprehend better. To perform this kind of testing you have to turn off the light. You will see the reflux of the lamp through the holes behind the TV.
Now, if you test eight lamps one by one, you will notice that the reflex of the light will not be uniform in all the holes. At the beginning of the testing, you won’t be able to see the light in the upper hole. Even in the lower holes, you can not see any light soon.
Anyways, if you came here to have a one-liner answer to your question, cold cathode fluorescent lamps (CCFLs) require a high-voltage supply for operation.
Typically, over 1000 volts is required to initiate CCFL operation, with sustaining voltages from 200V to 800V.
A CCFL can operate from DC, but migration effects damage the CCFL and shorten its lifetime.
To achieve maximum life, the CCFL drive should be sinusoidal, contain zero DC components, and not exceed the CCFL manufacturer’s minimum and maximum operating current ratings.