The size / power of the light you get will depend on a few factors.

1. How much space do you have? Small space = small light.
2. How many plants do you want to grow? Again, small space = few plants = smaller bulb.

From what you've told us I think a 250w bulb is where you are heading. If you have space and ventilation then bump up the 400w.
bigsby Reviewed by bigsby on . NEED HELP!!!!!!!! OK I'm new to growing I have made attempts but have failed in the past years but this year im growing indoor and out door my outdoor plants are doing great but i have a few questions about the indoor lights right now I have this light G.E. Reflector Plant Light Bulb - 6 Pack - Specialty Light Bulbs - Ace Hardware and since it said plant light I assumed it would work but Idk I heard cfl is better and that's why I want to get this one Satco® Hi-Pro 105 Watt Commercial Spiral CFL Light Bulb with Rating: 5