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shikhyung
10/22/2008, 07:07 PM
I saw some light bulbs at Lowes with marking such 18wR40(75w equivalent), or 26wPAR38 (90w). What does R40, or PAR38...mean?
Thanks,
graveyardworm
10/22/2008, 08:44 PM
Not the fast answer but from this list of articles you will likely find your answer.

http://reefkeeping.com/issues/subject/lighting.php
shikhyung
10/22/2008, 11:08 PM
got it. thanks