Dude, this is my first grow but I bought a 4' (6) bulb T8 polished reflector shop light and since HD doesn't sell 4' aquarium bulbs and I'm NOT paying $23 per bulb @ Petsmart (wtf?) , I bought 3 different bulbs sets @ HD and did a mix ...(2) 3100K inside, (2) 4500K the next outer and (2) 6000K on the very outside. No clue if this is the best stagger pattern or not. It's my budget way of mocking the spectrum of light they need. Now, some on here are already judging me for this set up but it's ok lol; Again, it's my first grow, I have 3 ladies all beginning to produce VERY herby buds with long white hairs. I might switch to an HPS or a MH just because the light frequency seems to be f'n amzing. I'd love to post pics but I'm just to paranoid about whomever being able to track my pics back to my files and ruining my anonymity....lame, I know lol.