Just to chime in...
I'm coming up on a year of having a 3ft SR260 fixture over my 120gal (48x24x24) reef.
I know there's not a lot of information available in the US for these fixtures and I had to do a lot of searching for answers. (UltimateReef.com forums)
Hopefully I can shed some light on some very common questions.
Before buying the Vertex fixture, I had purchased a cheaper LED unit that had no dimming capabilities and I burned a lot of my corals over two months. I went back to T5 lighting until I bought the Illumina. I did a lot of research before I started the LEDs again.
The fixture hangs 10 inches above the water line and I run an Expert Program that lasts 12 hours, but there is a three hour "sunrise" and a two hour "sunset".
I started out with my Royal Blues and Blues at 30% and my whites at 10%.
Once all my corals began to brown out from a lack of light, I very slowly ramped up the levels about 5% every two weeks.
After a couple of months, just about everything was back to normal.
Since the original purchase, I have added 2 Multicolor Modules and 2 Royal Blue Modules.
As of today, my Royal Blues max out at 100%, Blues at 90% and Whites at 55%. They only max out for about three to four hours.
I find that if the White LEDs get any higher, some of my darker montipora spp. corals begin to lighten up.
I've been running the same lighting program since Memorial Day; when last modules were added.
This was taken around Labor Day.
<a href="http://s32.photobucket.com/user/jason_langer/media/ReefCentral/VertexGraph083113.jpg.html" target="_blank"><img src="http://i32.photobucket.com/albums/d4/jason_langer/ReefCentral/VertexGraph083113.jpg" border="0" alt=" photo VertexGraph083113.jpg"/></a>
My only real complaint about the LEDs is that I cannot get my red montipora corals to brighten up like they did under T5s. The red color is muted and pinkish, not fire engine red like before. It has gotten better, but still not quite there.
I may need to start playing around with the Multicolor Module LEDs more to see if those help.
Any suggestions about how to help me regain my bright red color again would be appreciated.
I have had a couple small issues with the program and the V-Link.
I called BRS and was directed to Jen at Tech Support (PA?) and she was great. She fixed my issues and even answered questions/feedback about the fixture and program.
Remembering to install all the available updates is a must. It will drive you crazy trying to figure out what is wrong when you forgotten to do one.
I would like to see an App or other easier means of making simple changes to the lighting programs, though.
Overall, I really like my Vertex Illumina LED fixture.
And I hope some of this information helps some of the newer users.