Im looking at 400w hps light kits for arund 100 bucks and i have a 4x2x5 tent i am wondering if this would be a good kit for me or ahould i buy a led light
Take a look at timber grow lights or cobkits, for efficiency and stealth and savings, yep LED is the way to go. If you want up and running fast, dont care about waste heat or electricity prices, HPS.