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Originally Posted by Aquattro
Greg, you KNOW what you need....don't fight it.
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I fight the brave fight
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Originally Posted by Treebeard
I have been meaning to ask this question for sometime now, and this thread is the ideal place to ask.
From what I have read, T5 bulbs should be replaced approximately every 12 months. Why?? Is this based on quantitative measurements, or is it because Joe's Fish Store needs to sell you new bulbs once a year for his kids college fund?
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On the zeo system KZ actually recommends that you replace your bulbs every 6 months

I really think this is overkill.
A year seems to be ok but they do really lose a great amount of par.. I need to find the post by ihavecrabs, he did some par readings on his old T5's just before he changed them and then the new readings, it was really a big difference.