so i spent part of the eveining last night in cadd drawing up my new canopy... i think i have it figured out.. now i just gotta actually get off my lazy keister and build it...
the top of the tank is 48.25 long and 19.625 front to back, and i'm just gonna use 1/4 ply with 1x2 poplar structure on the inside... 8 54w t5 bulbs on 3 ballasts...
i figure that if the "facing" hangs down 1 inch from the top of the tank then that should hold it inplace, and the plan for now is to have all 4 sides held on with magnetic clasps... that way, i can get to any side of the tank... not like working through the little 6 inch openings that my current tops have...
the inner frame, and thus the lights will be about 11 inches above the water, so that should allow for plenty of air space, and then i can allways add fans if heat becomes an issue...
I'm also not going to use the "store bought" reflectors, i just cant justify the price, considering that with 8 of these bulbs over my 75, i'm well above the old watts per gallon rule of thumb... so i think what i may try and do is to just make my own...
my thinking is that i could take some 2 inch pvc, split it long ways so that i have 2 half circles, line thoes on the inside with reflective foil, and then go from there.. i know its not a perfect parabola, but i'ts gotta be better than no reflector at all...