the 8x54 does not have individual reflectors, it has a single parabolic. go with the extreme pro. it has 6x54 with individual reflectors. i think its a bit more money, but its cheaper to run, and has much higher light output. t5s dont actually have better out put than cfls, but their smaller diameter allows you to fit individual reflectors in, which greatly increases output (if you think about it, at least half of the lightbulb, and therefore the output, is not facing the tank). so if you dont get individual reflectors, its only slightly more lumens per watt than compat florescent.