Okay, first hand info. Thanks. What is your driver setup? I'm already committed on the 2 HLG-320-54-A... My grow space does have quite a bit of headroom and heat won't be an issue, not until summer, at least- even then I have ways to pump AC directly into the tent and at the lights. Portable AC units and I made a ghetto attachment that fits over the output that connects to 6in duct.Those prebuilt HLG225's they sell use a larger heatsink than come with the QB96 kit. I use 6 QB96's in a 4x4 run usually between 75 to 85 watts each. These are powerful lights, and unless you have a lot of headroom you won't want to be cranking them up that high. At 220w you definitely need active cooling with the standard heatsink.
7-days into 12/12 cycle:
View attachment 4722563
Nice setup, BTW.