You do know that the ballasts go out on those things? I used to grow with them before CFLs came along. I'd throw them out after one or two grows, because the electricity wasn't worth the light a degraded unit emits.
They can be bought for less than $20 each. Here, Homedepot has 'em for $13/each. Two or three bucks for the lights.
Arrange one across and two to light a couple of sides, and you can get close to an ounce without a problem.
Reminds me of my college days, I'd have a grow going all the time. And that was way before I understood what sensemia meant.