Do not use a heat lamp....If you need to buy a cheep light from HD get the security light made by "Lights of America" it cost about 40-45 bucks and will work it is a flourex bulb they make. Gives plenty of light (if you like florescent light) for just a few plants with out putting out lots of heat. You should get the light about 6" above the top of your plants. You should consider MH for vegetation and HPS for flower cycle they will increase your yield over fluorescents.