I was looking into those lights, do the 48" just have 6 36" bulbs? In the TPP catalog they list the wattage as being the same? Just curious. I am probably going with a 36" tank and getting the 36" fixture. With TPP's 30% off, you can get a pretty good deal. Btw I'm breaking down the 110g hopefully today, so the 30g is all yours.