Tek 4 x 39w T-5s. Sfigioli actinic, 10,000k, 12,000k and a blue +. That's it on mine and they are growing and the colors have remained fantastic. Some colors have even gotten better. I have a few on the bottom of the tank and they're fine. I also feed them once in a while.
I will use a 6 bulb configuration on my next tank if I don't go with halides.