its mainly to spread out the light and keep heat down.
IF i ran these 4 hoods with 4 - 600w ballasts its twice as much power usage, then running 4 hoods with 2 - 600w ballasts...so, how wouldnt i save money?? its half the power usage, and twice the light coverage... plus 150$ flip box is alot cheaper then a new ballast.
Didn't read the whole conversation so forgive me if I don't know all the info but I assume that you're running a 4x8' tent. If you are and you are calculating the number for 4 x 600's then that would be over kill cause you would be running 75 watts per square foot and that is just throwing watts away cause you wouldn't get anything extra out of them in bud weight. I don't think that you would personally run 4 x 600's in your 4 x 8' tent but you are still making the calculations for something that would not make sense to do so that the stagger makes more sense in your mind. You're not technically using more lamps because when 2 of them are on, the other 2 turn off. I've thought about doing this on a big scale with a minimum of 9 x 1000's, but in the end, it didn't make sense anymore. Maybe you don't have a 4 x 8' tent and I'm miss understanding what you are saying but I think you would like light movers more. Flipping your ballasts off and on over and over isn't good for it and unless you have digital (electric) ballasts, you'll end up using more power to turn your ballasts on. The idea seems nice but you might want to try different reflectors that cover more area to try to maximize your space better. Through my experience in growing, it seems like anything over 50 watts / square foot doesn't translate into more bud. I got these light movers called "Solar Revolution" that allow you to put 3 x 1000's under 8' x 8' of space, instead of using 4 x 1000's. When using this system though, the manufacture suggests that you use Bell Lighting Reflectors because they cover more area then most of the ones that I've seen. I also have a bunch of Light Rail 3.5's which are also really nice. Forgive me if I mistook what you are saying but you also said that you are trying to save watts and you also wanted to put a couple of 400's on the side as well. Can you tell us the exact spacing that the lights would be away from each other and how long the staggerd lights get turned off for before then turn on and the others turn off?