A CFL (compact flourencent) There are plenty of write ups on here about them. People make recommendations, but go with what you can afford. Any light is better than none.

See here:
http://en.wikipedia.org/wiki/Compact_fluorescent_lamp
Stickyplant Reviewed by Stickyplant on . Im on flowering stage. I need help please ??? Hello everyone, i have two plants on 4 day of flowering stage and i i need some help, my fan leaves are covering all the litle ones. I need some help how to tie them down or trim or whatever i should do, it's my first grow so i don't have a clue, i read about triming and tying them down but i dont know how to do it. Can anyone explain that to me please, i dont want a hurt my plants ??? THANKS :) :):thumbsup: Rating: 5