[quote author=iani link=topic=5363.msg67275#msg67275 date=1228499803]
You can also think about it this way, 1 4 foot VHO bulb = 2 T5HO bulbs in wattage (not true if you overdrive the T5HO). For VHO because of how big the bulb is a reflector would not do any good. Its not that it has a built in reflector like people say. With that said aren't you wasting a lot of light with VHO bulbs?
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Yeah yeah yeah, PAR this and output that, the UVL VHO T12 still fluoresces coral better than any other bulb. That's what supplementation bulbs do, they are not there to grow coral, just make them look pretty.
Plus you are not "wasting a lot of light", a little energy maybe, but light, no. If you put VHO's side by side one with the reflector one with out you will see a big difference in output.