What type of grow are you planning? If a single plant buy a spiral CFL plant bulb. You can buy them on Amazon for around $12. Go to Wal Mart and buy a cheap aluminum reflector. That will get you going. Keep the light just a weeeee bit off the plant top. If more than one plant buy a fluorescent fixture and plant grow bulbs and do likewise. For flowering you will need a High Pressure Sodium light. I suggest 400 watts but many go with 250 and get good results. Poor lighting makes for poor bud.