I've seen at max 150w HPS in a PC case. The guy removed the PC power supply, walled off the area from the bottom of the power supply up with glass for the HPS to live, with a fan for intake and one for exhaust. Ballast on top of the case, external to avoid the extra heat.

Seen a grow on icmag, 22w LED yielded 38 grams - who cares if it's fluffy, 38 grams is 38 grams!

You should watch my 50w micro grow in an old 90s SGI A/V workstation. Link in my sig.