Dude , what's your beef with me man, I came here to just say that from experience that Mars are not good lights. Not to hijack this thread and banter with you on my light. Yes you grow and you learn, I don't need 640 watts of led for a 39" x 39 " tent and no.. a Mars is not on par with my current light. When did you decide that Mars and Kind and those like it are not acceptable lights. Please inform the thousands of these light users that their grows are no longer acceptable in today's standards according to you your Hineass ,Dude you really are a condescending asshole..seriously lol. And your a supposed business man... flake.