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#1
04-12-2010, 06:46 AM
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For comparison purposes Eugene at Oceanic Corals tested their 400W MH fixture (in their LED spotlight thread) and says that PAR was 500 at 12" below the water. I had 400 PAR at about that depth with the fixture say 7.5 inches above the water. I'll try to test with the fixture closer to the water at 12" depth and see what I come up with.
But I think my 400PAR as tested so far shows pretty well against the MH. 
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#2
04-12-2010, 06:50 AM
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Oh, and just to Spam my own thread a bit testing by the LED leaders at nano-reef.com shows that the drop off in PAR vs. depth is less with LEDs vs. MH. That makes sense as with the optics virtually all the output of the LEDS is focussed down into the tank. T5s and MH, even with good reflectors, probably have less cohesive light with more scatter from the reflectors as they emit in all directions and then rely on the reflectors to focus the light down if that makes sense.
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