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View Full Version : Replacing MH bulbs


butts182
12/10/2009, 06:43 AM
When it is time to replace my MH bulb (currently have a 250w XM 15k in a hanging pendant), I am thinking of switching to a XM 10k. Do I need to raise the light or shorten the time the light is on to acclimate the corals?

Hawaiigold
12/10/2009, 08:21 AM
I replace mine once a year ... 250KW 10k

godiver908
12/10/2009, 11:52 AM
Is there any way to test if they actualy need to be replaced within 1 year or iff they are still good?