70w HPS and maybe a deodorizing light bulb would be no problem in a cooltube. 150w is pushing it... I don't know if the 70w will provide enough lumens though. 1.8 square feet and I will be using it all with plants. So around 6000 lumens from the HPS, then 1600 from the deodorizing light bulb, so that would be 4222 lumens per foot, that is acceptable.