That linked ebay fixture is an Evergrow fixture, which reefbreeders imports, which you put down.
You also sell $600 fixtures that still use only cool white and royal blue. If you have used leds longer than others in the forum, in the first year you would realize that even though you can grow coral with that setup, you will lose color on many pieces. Reds will suffer the most, as you will watch acans and chalices with red pigments turn bright orange on you, or lose their intense coloration.
Not only does it not hit the photosynthetic requirements that most coral need, It is also not as appealing to the eye as a fixture which incorporates neutral whites over cool white, and includes violets in the 400-430nm range, along with some 660nm red for visual coloration and that peak (which is also heavily present in such T5 bulbs as Fiji purple, which everyone loves to run)
My results in growth and color have improved dramatically ever since I implemented that change. Just about every time I bring home a frag from my friend's AI Sol Blue covered frag tank, it always colors up much stronger, and sometimes to a different color, especially if it has "orange" in it. Those are CW/RB crees in there, and XT-E CW does not add in any magic spectrum over the XP-E/G. NW Crees are stellar. None of the major manufacturers use them yet either. Give that about a year before they catch on.
I hope you can add these leds at some point into your fixtures as well. The difference is very noticeable. Try it out.
If you added some violet/red on separate channels, changed out the cool whites to neutral, added ~475nm blue, and maybe even 495nm cyan on their own channels, you would have a stellar fixture that separates itself from the pack on the market. It's a pain since it requires a pcb change, but its well worth it.
