So I ordered two 35$ led fixtures it says they are dim-able but no dial to do so so I’m assuming if I buy a controller it would work... honestly I’m impressed even thru black metal mesh screen lids and 1/8 glass sheets the tank shimmers! Do not own par meter but I don’t think I even need one as I don’t have corals yet and can just experiment with placement and save 100$ I don’t have lol but if your looking for a low cost light I recommend highly I could even get two more and still only have like 4/5lbs total on the top... they are super light weight sleek and clean wish they used 90 degree power plug in the fixture but on a 6’ tank two 36” bars sit perfectly... so 4 would work as well if I need that much light ever lol I’m sure in a year or two that may be needed lol check um out! 4 to the door for 140$... that’s a lot of light of min $$$!!!