I do not know the answer because I never have a chance to test the par on 2 ft ATI PM. Here is the par reading from previous posting by rhoptowit. His tank is 12 in. high and he is running 4 bulbs 2 ft ATI PM. At the sand bed level, the par is 328. You will get more par with more bulbs for sure. IMO, 8 bulbs will be enough with all high light animal placed at upper half of the tank.
You should try T5 Q&A thread, I always get very helpful information there.
Quote:
Originally posted by rhoptowit
my second tank is a 20L lit with a 4 bulb ATI PM, the fixture is situated 4" above the water's surface. the bulb combo is.
front
ATI blue plus
Fiji purple
ATI aqua blue special
ATI blue plus
back
idk if this will be much help as i dont have any info from when i first put these bulbs in this fixtures. but i suspect that after reading this the 36" fixture is not so great when compared to the other PMs. kinda bummed. i did notice the 36" PM runs alot hotter then my 24" PM, and the ATI true actinic in my 36" has seemed to diminish in visible output alot.
well hope this helps.
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