Jus get a lamp that can hold normal bulbs(2 lamps actually) and get 2 100 Watt light bulbs, my buddy and i use 1 100 watt bulb and the plant is healthy and growing strong....(they make it seem soo complicated, but it really isnt, once u got all the shit together and read a faq once or twice, its quite easy).
Use metal Halide for vegative growing then swap over to Sodium to flower with a ''Son-T-agro'' bulb or equivalent. Increase the lux, increase the yield. Normal light bulbs do not have the correct frequencies to replicate natural sunlight.