^^what ink said.
Mine all came as a single unit: 1000W bulb, ballast and shade all-in-one wired with a 110V 15A plug ready to go.
Not only that, but I bought it used off craigslist for $75 - keep yer eyes open.
I've just used flouro, but this was a deal I couldn't pass up. A 940W HPS bulb that will work with this ballast ('conversion bulb') runs $100-250 and saves on needing another fixture, though the 5A timer I had the CFLs on will need to be upgraded to a 15 or 20A one (about $30)
It doesn't have to cost an arm and a leg to grow weed, but I'm blown away by the difference the 'new' light makes. It's definitely been a worthwhile upgrade. I flowered small plants in 2 liter pots under CFLs and the smell was easy to deal with. With HPS, I expect I'll need to upgrade that too, so the costs keep going up....but I'll get more out of it when I'm done.
This is the light. The box on top is the ballast.
The lines are because of how the camera 'sees' the light and aren't really there. It's just a mind-numbingly bright white light
Not really comparing apples to apples here, but this was typical of what I was seeing with flouros for veg and CFLs for flowering:
See the big spaces between the branches (nodes) ?
As I understand it, that's typical for flourescent. The buds don't grow into the classic tall colas that you see, they stay as domed nubs...but it doesn't affect the smoking....
This is one that's been under the new light for a couple weeks. It's a lot more dense, but like I said about comparing apples to apples, it's a completely different strain as well so that probably has a lot to do with it as well. I guess I could do a side by side test, but meh.....
Again, I'm no expert. This is just what's worked for me. If it gets you growing sooner, then flourescents are the way to go !