Well I went to Adams today and did some measurments on his lights today.
His set up is the 400 watt Radium 20K and three 30 watt NO actinic bulbs
12" distance = 343.09 PAR
18.5" (bottom of tank) = 269.9 PAR
I think it was 4" of air and 8" of water (Adam can you conferm this? I need to know how far it was from the bottom of your bulb to the water)
Steve
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