I have a 135 gal. that is 6' long and I bought a pre made lighting system that kicks butt. It has 3x150 mh and 4x96 dual attintic, but if I was to do it over again I would have built it myself and used 250 watt mh instead. It would be much cheaper! The unit I bought was $900. Someone on this site can give you instuctions on how to build it.