It's a SHO (super high output) cfl bulb...6300 lumens - equivalent to a 525 watt bulb. I'm guessing it has a similar type reflector to those clamp aluminum shop fixtures.And, what is a 105 watt CFL light?
Thanks :icon_biggThis is a far out extrapolation, but my guess is that that bulb in a vertically mounted reflector, like the Home Depot worklights, would give you:
at 20 inches: 80-130 micromols of PAR
at 24 inches: 50-120 micromols of PAR
at 30 inches: 30-60 micromols of PAR
Does that mean you have it 40.5-42.5" above the substrate? You may need to lower it (maybe somewhere between 3-8" above your tank). I think those numbers hoppy gave are inches above the substrate...could be wrong though.It's about 18-20" from the tank and the dimensions are 20.5x19.5x22.5". Sounds like I should raise it a few more inches. So is co2 recommended for this amount of light?