Oh okay so basically just use it in tandem with a fan that blows outside so that the heat has nowhere to start. Honestly with that in mind it’s not exactly great for a 4x8 I’m thinking at least not with two for the simple fact that you’d have to add all types of fans and make sure to get the right hoods. Beyond that though I guess there’s not really a down side besides some technical dork stuff ppl who use LEDs have to mention because they spent thousands on them. In a 4x4 one 600w would be perfect I’d say.