i recommend the CFLS for a big yield, small 1 plant grow, because of the low heat. Say you're gonna be gone all day and for some reason have to shut the door to your room or can't run the AC or something, with a cfl you'll be fine, with an hps it'll be too hot. Let's say your veggin and you've got this light on 18 hrs a day, with a cfl you can keep this light in a bedroom, and still sleep cuz the little heat it puts out. I do think HPS are better for flowering and I have tried both, but unless you're ready to go all out, and air cool your lights and set up sophidticated ventialtion systems, stay with a cfl for veg and flower. After your first harvest, you'll have saved and made enough cash to do four plants with a 600 or 1000 watt and air cool your light and set up your room.