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I've got the 2000's on a 75 gallon.
I have them 1" above the water, in the water just under surface is 1100-1200 par, about 12" under the surface they give off 500-600 par, at the sand (around 17" under) they give about 100-150 par.
On a side note, my firestorm monti grows like a weed under these compared to miniscule growth under a 150w MH. (ya, it surprised me)
They're well worth it for cost savings, PWM makes the difference. But their controller is as generic as an outlet timer. (you can only do ramp on/off and levels and thunderstorm mode)
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