You can use the Highest Wattage CFLs with reflecters or 4 foot Daylight Cool Floro tubes , thoes are the cheapest option, its what i used for a while. the tubes added 2 small CFLs and a free 70 watt metal halide, IF u can afford it use HID Bulbs there are 2 kinds MEtal Halide and High Pressure Sodium, the MH is for Vegitative growth and the HPS high in the red spetrum of light for Budding . its very important u invest in a high pressure sodium lamp to get any kind of good yeald. but u dont absolutly need a MetalHalide, Floros or CFLs are good for Veging on a low budget, i know were u can get an entire HPS kit with the ballast bulb and reflecter for $119 bucks.