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I have really good and old laptop (IBM t60p with t61p board). I just replaced whole screen because CCFL lamp died after many years.

Can I extend life of CCFL by using laptop with reduced brightness when I don't need 100%?

It is hard to find new LCD or CCFL for this model, I want it to last another few years.

Kamil
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Actually, to my knowledge, cold cathode lighting sources can have their life shortened by a lower brightness. It uses thermionic emission, and thus heat assists it's operation. Likewise, the gas inside the tube is turned into a plasma, allowing easier current flow. When you lower the brightness you also lower the current flow, which further causes issues.

Jarrod Christman
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