I was recently over a fellow growers house and noticed his 600w HPS. I have the 400w HPS that came with the StealthHydro 400w kit and it has worked, but I believe it to be inefficient in both the ballast, hood and of course electric bill. So, I'm thinking of upgrading and was wondering who knows of the best one for a decent price ? I want to do this once, the right way. I may opt for a 1,000w HPS if my elec bill doesn't go up too much more. Hope this makes sense & Thank you for your responses in advance. I promise to throw some REP your way bro's... Peace.