Quote:
Originally Posted by Ephraim
actinics i change when they burn out, they give off little usable light, if any, for the corals anyways.
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A lot of the 'blue' bulbs now actually have a fair amount of PAR.
Your could always use a PAR meter to track the output of the bulbs, but I suppose that wouldn't catch any spectrum shift.
The recommendation seems to be around the 9 - 10 month range. 6 if you're made of light bulb money.