Correct. It does help to have a reflector though or at the least to paint the inside of your canopy flat white. You will get a little extra light into the tank that way. I did run mine original setup of 4x110w VHO over my 90g with the bulbs just laying on top of the tank, so it will work.
Sorry for the hijack...
I realize that the good bulbs have internal reflectors but has anyone ever tried to scale up a Icecap/Aqualux type reflector built to T12 scale?
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