<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by gsmollin:
I did a test, recently, where I measured the light intensity of 1 month old PC bulbs (360 hours use) against 10,000 hours bulbs. The difference was that the old bulbs had 80% of the light intensity of the new. I posted this info here, somewhere, but I haven't been able to find it. I also posted the spectrum of the old and new bulbs.
So you can decide if that's good enough or needs replacing. <HR></BLOCKQUOTE>
Shame on me for forgetting about that earlier post of yours. Here is that excellent information: http://aquabotanicwetthumb.infopop.c...565#9116064565