Quote:
Originally Posted by DEAD_BY_DAWN
does anyone have the answer when the time comes to replace them,there are lots of advice on the net anywere from 6-18 months when do you replace yours ?
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Here's what I found with some 36" PC tubes. I measured the output with a Lux meter, and found that half the output was gone after six months. That was more than I could put up with, so I stopped using PC's on two of my tanks.
