sorry i didnt no you were going to keep the pc with the halide.i understand the watts per gallon i just use it as a guidline not true math.you will be contending with allot of heat and electricity with all those are you going to lose one of the pc and add the halide?that will work but how will look are they indavidual light balast cause in the first post u say 4 pc.see if you can sell them and buy a unit with everything in one easier to control not so many plugs.i have my bta under led and t5,s with 11 watts per gallon and he has allost filled my 50 gallon in one year he is loving all the light glad he is the only thing i have in my 50 a huge bta and pair of tomatoe clown and some live rock .i got him he was only 2 inches now he is over 12 in one year.he can shrink to nothing whenb going potty.i just thinl they love allot of light.gl