I'm trying to add some t5's to my tank (40b) my kessil and hydra will probably do ok but I want the growth from t5s. What's the best retrofit? Or the best bag for the buck. Also do you guys think I should go with 2 bulb or 4 bulb supplement. Thanks!
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Haha I would love to do that but 600 for a fixture is most definitely out of my budget right now xDI believe NanoBox offers retrofits. I thought about getting an ATI sunpower and having them retrofit my hydras into the fixture. I was looking at an 8 bulb fixture and then having them retrofit my hydras in where the 4 middle bulbs would be to leave 4 t5s on the outside and the leds in the middle. I don't have a canopy so that was the cleanest option I came up with.
Are you saying you don't want the growth from the spotlights (Kessil and Hydra) for some reason?
Or are you saying you don't think spotlights will grow corals?
You might be over-worrying about light, or the wrong aspects of light. Or you just have the wrong lights in all cases.
I read in another thread that you had issues (theoretical or real?) with the shadows cast by some or all of the fixtures. Did I get that right? And if so is that the main reason for wanting this supplemental light?
Just from what I read, and heard, LED's have great coloring but doesn't have the growth like t5 and mh.
Too many other factors and too many pure-LED success stories for there to be much truth in that.
Unless you have excess money to tie up in excessive lighting, I'd pare down the lighting and focus on one fixture/brand that you like the best. Set up with lenses and power in mind, none of those should have growth or color issues.
What you could be lacking is a light meter, and possibly stability in water quality.
Where does the system stand today on:
lux
Ca
Mg
alk
NO3
PO4
How and what do you dose?
Water changes? How often/how big on average?
If you like the more complete/less-shadows coverage that T5's give, then conside strip LED's rather that the spotlights you are focusing on.
You can use the PAR meter to make a conversion factor for the lux meter specific to your lights. With that you can convert any lux reading you take into an accurate PAR number, any time you need to. (You won't ordinarily need to.)
I mean I love the LEDs but the constant doesn't have the growth comments has kinda made me atleast get supplements. I mean doesn't hurt![]()

Doesn't hurt? My wife would kill me if I tried to buy four light systems for one tank! Might not hurt, but I wouldn't count on it. I think it might hurt a lot!![]()
In seriousness, just be sure to make it worthwhile and take measurements of everything and take notes along the way. Keeping a journal on anything always seems to boost the learning factor – keep one on your tank if you aren't already.
Regardless of the lights you choose, I would still question 100% of the sources that give you the "doesn't have growth" vibe on LED's.
(I still say any one of the lights you have/have had could be fine...or if not, you should be considering strip-LED's instead of the current course...PM me if you want to talk about LED setup and other stuff. 2¢)
). I'll probably end up selling these lights for Radions sooner or later and have t5's just to have it. Might as well have best of both worlds, plus if there is any shadowing, the T5 will take care of it. I mean T5 is plans for the future :3 just getting a better idea of things. 
Spending time researching reflectors is better time spent than the retrofit kits themselves. Bulb choice I will always recommend going ATI, but Giesseman is a good alternative. I believe LET had the better reflectors last time I did the research if you want to buy a kit rather than assemble it yourself. Myself I have used T5 only for 10 years now and I see no reason to switch in the foreseeable future. The 8 bulb Sunpower is hard to beat on value and reliability. That said since you already have high quality LED fixtures adding some T5 retrofits will definitely get you the best of both worlds. Can't beat the spread and ability to light up every crevice and eliminate shadowing. The only downside as I see it is that T5s have a tendency to reduce the shimmer effect from LEDs.

