What are the demensions of the 150? If it is a standard 150 72" X 30" X 18", I would go with 3 X 400W MH with 2X 72" VHO actinic (or NO ), That may break the bank, so letting us know what you want to keep will be a big help. 150's are deep tanks and if you want to have good lighting at the bottom of the tank...your going to need very intense light. You can prolly do LPS and softies with 6 X 96W PCs or 6 X 72" VHO, but niether will have the penetration of the MH.