Lighting

Have a quick question. Ive been reading a bit and have been thinking about moving up to a 600 hps from a 400w. Wouldnt be a huge job to wire a new balast and get a new bulb for the cooltube. The articles ive been reading are saying a 600w is perfect for doing a 1m x 1m area which is the size of my grow tent. They're also saying it is the most efficient for the watts. My question is, is it the most efficent, and would be be noticeable the jump in wattage in relation to the cost in electricity. Dont want the fuzz catching on. Also I run the hps from 8 at night till 8 in the morning. Would this also attract them. Just looking for some advice.

not a big hit to the power bill at all. relax and enjoy the upgrade

you're making a wise investment. no need to worry about the increase in power, the power company doesn't know that you didn't just buy a brand new flat panel television, do they?