My tank now has 2 MH one at 175 and the other at 250 it also has an ice cap 430 ballast which is pushing 2 36" (39watt) t5's (retrofit), both blue. I would like to add 2 more blue t5's. My question is: I have read a few sites that that this model can run up to 12' of lightng and others that that it can only run 2 at 39 watts. Also when I bought this retro it was stated that they are running at overpower, or something like that, I am quessing it inceases the watt performance. Anyway does anyone know if I can add 2 more blue to this ballast, or it would cut down on the "overdrive" and equal the same effect.