05-02-2012, 05:10 PM
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Originally Posted by Geomancer
They came in today. I was pleasantly surprised to see they are Phillips brand, and not some knockoff no name brand. Checking the numbers on them confirmed they are 6500K. Well, they could be counterfeit, but good enough for me =)
That was a good price on them though. Anyone know if the 1 year rule is from manufacture date or is it based on hours of operation? Thinking I might buy more to stockpile ...
It is hours of operation. Fluorescent tubes emit light by burning phosphors, and as they burn the intensity decreases. It varies sometimes from brand to brand, depending upon how they're made, and I have read estimates from 1 to 3 years for the T8 which are better than the older T12. I found at 18 months that algae began increasing, and suspecting the tubes may be getting dim I replaced them. End of algae increasing. I now do this after 12 months, regardless.
A local chain pet store closed down about 2 years ago, and I got a bunch of Life-Glo at 1/4 cost. No harm in stockpiling.