Hmm, tell me about your ballast cooling chamber. I've built a grow light from parts found at a electrical supply house. Ballast/transformer $55, extra large socket $16 and hps bulb $16. The ballast was already prewired. How far away (how long can the wire be) can the ballast be away from the socket? Some guy said 3 feet. That's not very long. Where do you put your ballast? That is one heavy sucker.