Check here and tell me if this is a good deal

http://cgi.ebay.com/Hydrofarm-Lumatek-600-Watt-Digital-Ballast-/110653947704?pt=LH_DefaultDomain_0&hash=item19c37d3f38#ht_500wt_1156
Also is the ballast the thing that I insert the light bulbs into? I'm confused. Ok I'm sure its the thing u put your lights in. blablabla oh well. This dude didn't put much info in this. You tell me.

You put the bulb in the reflector and plug the light into the ballast

Good price.
No reflector with that so you'll have to buy a reflector with bulb holder (bulb holder normally attatched to reflector when purchased.)
Quote" dude didn't put much info in this"

He said exactly what it is....
Maybe wise for YOU to read up alittle on how to grow indoor using light and research equipment.... It'll help you stop getting electricuted, buying the wrong stuff, burning your house down and grow weed worth smoking, rather than binning....if you make it to harvest that is.
You find google and also looking at online growstores very handy for familiarizing yourself with stuff..... click google images.

http://cgi.ebay.com/SWITCHABLE-HPS-METAL-HALIDE-400-watt-Grow-Light-w-mh_W0QQitemZ270604179199QQcategoryZ42225QQcmdZViewItemQQ_trksidZp4340.m263QQ_trkparmsZalgo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D10%26pmod%3D270663192786%26ps%3D63%26clkid%3D7499530332676857083 here's a setup with everything you need