I was in your same boat when I started my grow, which is my first one. I read about how HPS or HID lights are so much better than CFL. If you are like me and growing for personal use or as a hobby, go with CFL, especially for just one plant, its a good way to learn as you go. I have figured you get what you put into your grow, of course if you have a high watt HPS than its going to be more productive than CFL, but if you have the means for a HPS light then go for it. I can't afford those lights so I used the CFLs I got from my electricity company for free. Not only did I get free lights, but im getting a tax credit for essentially growing marijuana because im being "energy efficient" with the lights that I am using, check out my box grow if you'd like, I am happy with what I've seen so far from my CFL grow. Not to say that in the future if I get the money and means to get an HPS light then I will probably try that out too. Its just personal opinion...imo