11-22-2005, 03:33 AM
Join Date: Mar 2004
Location: Leverett, Mass
iTrader Positive Rating: 100%
You should be just fine with the 40 or 36 watt fixture. I have never owned either so I cannot comment on the fixtures themselves, but that amount of light should grow it just fine.
72 watts? Are you considering a 2x36 watt fixture? If so, that could work well, just stagger the lighs, have each one one for 8-9 hours but stagger them so they overlap for 4-5 hours at most.
I would not attempt 72 watts with out press CO2, you could probably pull off 36 watts DIY with out much issue though.