Yes behind the bulb is a reflector and usually behind the reflector you'll find the ballast. If not behind the reflector than really close to it somewhere in the head of the lamp. It won't be in the base of the pole.
You'll need all the parts of the ballast including transformer, cap, ignitor, and there are probably fuses and maybe a thermal breaker.
When you're done stealing all this stuff you'll also need to find out what voltage it needs. Probably 220 or 277 volts. Cut the cord off your moms clothes dryer. You'll need some thick nippers for this, then hotwire the ballast properly onto the cord you just aquired and gut moms dryer to make a stealth grow cabinet.
Put a lock on the dryer now and next time mom asks wtf say:
"Shut up bitch, it's mine now, leave it alone." and then say "Get your fat ass in the kitchen and make me a pie"