@Silverfox125 @Chris Scorpio thanks for the mention. For that size space ideally you would want at least 2 of our 250w lights with the xl heatsink. For exceptional coverage you could add a 3rd light.I'm getting ready to start up 6 under lites in a 5'X4' space. I can't hack paying to operate HID anymore plus the heat is unaccepttable. I need to know how many LEDs for this space, and what rating, and brand. Thanks so much.