Never buy a ballast used you don't know how somebody else treated it how it was hooked up or how long it was actually used best of pay the extra money and get one new
It would all depend on who makes it but with two 150 watch your best to go with a 400 that way you don't blow anything when it comes to ballast and all that crap you really need electrician or somebody that knows what the hell they're doing standing there
High pressure sodium and metal halide create the strongest and best bud and as I higher yield LEDs are the next best choice after LEDs you've got compact fluorescents and regular fluorescence and halogen bulbs just plain out suck
These are 2 of the first 4 clones I've ever taken in my life...they was the 2 I originally dipped in take root powder and put in soil...thanx imhigh85 for walking me thru it
Hey 907, if you have any kind of nursery in your area you can check them for used pots. I know the ones around here sell them for dirt cheap. lol but really I can get 10 gal. Tree pots that they repotted for $3.50 a piece. Hope this helps.
The 400 HP's I have is all contained. It's old but all I have to do is plug it into the wall socket. The ballast is inside the unit already booked up. Just make sure you ask the seller if it's plug and play or if you need to purchase more to get it working