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Posted by Marissa on June 12, 2000 at 20:24:06:
In Reply to: Lifespan of full-spectrum fluorescents posted by Andrew on June 12, 2000 at 16:55:42:
I have always generally changed yearly on the date of purchase. After about 6 mos or so the UVB output starts to diminish. Of course, the old bulbs that still shed light always double as plant gro bulbs!
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