if you want one bulb look at the envirolite its a 125 watt cfl and can be used in the veg cycle and in the flowering cycle if you want cheep lights then get as many 42 watt cfl's(150 watt incandesent) as you can and place them within 2-3 inches surround the plant with those and you will get a decent harvest for two plants need more info on the stems agr of plant ?clone? soil? ect

good luck-Bomb