If your planning on an SPS heavy tank or a mixed reef and decide on T5 then go with a 48" 8 bulb unit. Don't bother with the 36" unit. Will it work yes, will you be looking for a 48" in a couple of months, again yes. ATI is the cream of the crop but don't get hung up on the name, there are many other T5 units that will work well also. TEK is probably the next most popular unit. But they do not make them anymore so you will have to buy used. The biggest keys are good reflectors and quality bulbs. I had a TEK 8x54watt on my 90gal mixed. I had plenty of lower light areas to put whatever I wanted. Plus I could and did have SPS everywhere in my tank, including the sandbed. I would not hesitate to put that over the DB 80gal. As for replacing bulbs, this should be done around 8-9 months on a light that is not cooled, you can go longer but not much with fan cooled light. That is an appealing point of the ATI over the TEK. The fan will allow the unit to run cooler and thus allowing the bulbs to be more efficient.
I just switched to LEDs a few months ago and so far in happy. I switched because of cost. I was ready for a bulb change and figured the $200 for that could be put to better use. If I decide I don't like them though I will not hesitate to go back to the T5, which I held on to.
I just switched to LEDs a few months ago and so far in happy. I switched because of cost. I was ready for a bulb change and figured the $200 for that could be put to better use. If I decide I don't like them though I will not hesitate to go back to the T5, which I held on to.