you will definitely get much more light using a t5ho fixture. i wouldn't use more than a 2 bulb fixture though. as far as bulbs go, 6700k is the correct bulb. they can be gotten at most aquarium shops except petsmart. they only sell t5no. most are comparable to other, but geissman are top of the line and their price reflects it. you can get decent lighting from aquatraders.com. i have several of their units on my planted tanks and they are pretty reliable. and you can't beat the space saving feature of going from cfl's to linear bulbs. if you want a lot of extemely boring tech talk about lighting, i can link you to a really informative article on another forum if you like....lol