I thinkI need lighting.

[kwtowmaster]

I have a six ft. long 150 gal. reef tank.I have 2 four ft. lites.one is a purpleish compact.the other reg. twin tube w/ Ultra trilux bulbs.I offset them,push one a ft. to right the other a ft. to left.I dont think I have the rite lite.I was thinking maybe putting 4 three ft. double bulb.My question is what kind ?and where?price?or is that the right way to do that?