I just today talked to an experienced man at my LFS
and he says he would much rather recommend LEDS Vs Florescent, one of the reasons being they last really long, and you don't have to replace the lights. They also have the spikes in the blue and red spectrum's which plants can see but humans hardly can. They also are bright so it makes the tank look good for the human eye, I personally use fluorescent bulbs and have 2 of them and they work great for me, because LEDS are cheaper in the long run yet more expensive to buy. And im pretty sure that LEDS would work for deep tanks as well, you just get brighter ones. Because my LFS
has leds on there 125 gallon tanks and they look bright and have plants thriving. Hope this kinda helped.