if anyone could provide me with some links to one that would help and be appreciated! I think i would go with a 48in or 60in one, the new tank is 5ft long which do you recommend? the only thing i was wondering with a 60in t5 is if it would fit in the canopy since its the same size as tank?
Also how much heat will one of these retrofits put out? Since i only run LEDS now i dont have a heat issue so wasnt sure. I plan on putting a fan on the back of the canopy to blow some air in. I think i will have it come on when the T5s turn on. Was also thinking i will run T5s 3-4 hours a day, mid day. During that time i would power the LEDs down and turn them back up when T5s are off then slowly power down until night? Any suggestions? thank you!
Here I'd a link for the 48" LET retro kit
http://http://www.bulkreefsupply.com/4-ft-let-lighting-miro-4-t5-high-output-retrofit-kit.html
I don't believe BRS carries the 60" but if you do a Google search for LET Miro-4 60" you will find a number of places to order from.
I installed 4 bulbs of supplemental T5 to my LEDS last summer and am very happy with it. Installation isn't too hard but the wiring can be a little tricky as no instructions were included but the wiring diagram is on the ballast.
I think you could go with either size for a 5 foot tank. I personally wanted edge to edge coverage. As far as fitting in the canopy, they are shorter than the advertised length, for example the installed length of the 48" kit is about 46.8" so fit with the 60" should be no issue.
You will add a little heat but it won't be bad with just 2 bulbs. For myself to get 4 bulbs of supplemental on an 8' tank I had to add 8 bulbs, (4) 48" bulbs end to end and a fan on the back of the canopy, timed to run when the T5s are on, handles the extra heat just fine.
I agree with what others have posted on bulb selection, 1 blue plus and 1 coral plus.
I run 2 bulbs for 9 hours and the remaining bulbs for 4 hours, though may move this to 5 or 6 over time.
I wouldn't necessarily decrease the intensity of your LEDS when you have the T5s on, though you may need to adjust color on them to get the look you want. Just start with a short duration on the T5s and increase over time. Keep a close eye on your corals and let them be your guide.