I have found that my VHO's gave noticable changes after 8 mo. Most reliable literature that I have read says change your VHO's every 6-8 mo. which coinsides with my experience. As for MH, I just upgraded mine so while I don't speek from experience, the reliable books say approx. 12 mo.
It really depends on whether you are going for the best conditions for the corals (change your lights often), or are trying to stretch every last penny out of your bulbs at the expense of the livestock. You can sustain your corals if you push your bulbs but your growth rates will drop off.
Rick[/i]
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08-31-2004, 04:47 AM
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