I just did this same set up last week on my 110 -5'long. Im going from mh to t5 so I was a little nervous and I wanted to stuff as much t5 as I could so I was gonna put 8-60" aquctinic reflectors with two 660's. I settled on 6 48" Icecap reflectors and they BARELY fit. One I had to mount on the canopy frame instead of the hood and the Icecap LED moonlight tube had to be mounted on the frame in front because Reflectors aside the Icecap Endcaps are wider than you think. I am still running both 660's and I probably have too much light. 4 of the bulbs are Geisman actinic plus and the tank is still very bright. I used a piece of 1/4" plywood to mount the endcaps and two pieces of shoe molding glued together to mount the reflectors (approx 1 1/4" from the plywood so that they reach the endcaps when clipped in. Having the light pane significantly shorter than the canopy as well as using minimal amounts of wood helped with the weight issue, Ive got pics but I have to wait until I get home to post.