Did you get better result after the switch?
Better coloration ? You 100% satified?
To be honest, the first 6 months were kind of trial and error. But once I got the power levels up and got a PAR meter to know just where I was at, I was very happy with them.
Under more white midday settings the corals look almost the same (in terms of coloration) as under MH & t5 combo fixtures. But under late morning and early afternoon setting which were cooler white, the colors have a little bit more pop. The HUGE difference for me was when I saw how many corals fluoresce under the more blue settings. The last 3 hours of my sunset is way more blue and I've gone for corals that fluoresce better and the tank looks like Pandora at night (think the movie Avatar).
I snorkel a lot and I know very well what real reefs look like. And during the 6 to 8 hour midday, my tank looks pretty normal. But I have come to love the pop and crazy colors early in the morning and in the evening. It's really like deep ocean bio-luminescence or something totally alien.
As for coral growth, it's an 80:20 issue. The 80% happy is that the corals grow just as fast and as healthy as before. The 20% is the fact that leds do have very focused light and most branching sps corals do tend to get bare on the bottom of thick branches and on the undersides of thick colonies like birdsnest and pocillopora. It was an issue I could deal with much of the time by regular maintenance fragging.
The biggest change, and for me, the biggest thing I like about leds is the ability to control the light (if you get a quality fixture). My current leds all have the ability to do multi channel (6) color and sunrise/sunset control. So the look of my tank changes DRAMATICALLY from early morning dim and blue, to brighter but still blue, to brighter and very cool white, to a medium white midday and the after 4 hours it does the reverse. It's like having more than one tank. And now I even have more white at the front of the tank and more blue at the back of the tank which gives the illusion that the tank is more than just 2' thick.
Am I 100% satisfied? No. But on the other hand, unless something big changes, I'd never go back to MH or t5 and give up the easy control of color and intensity I get with leds. When I decided I wanted to try the white up front and blue in the back idea, I tried doing it with led/t5 combo. I put a cool white t5 at the front and a blue t5 at the back of the tank. The total lack of being able to control how bright the t5's are destroyed the look of the tank. I switched the t5's for led light bars with blue and white led at the front (and 2 channel dimmer control) and all blue in the back (also with dimmer control) and my Photon V2 over the middle of the tank. It works WAY better IMHO.
If I could change anything about led fixtures, would I? Yes. I'd eliminate the red and green leds OR add more and spread all over the fixture, take away the lenses so the spread light better and mix better with the whites and blues and finally, make them on a separate channel from the whites. Mine has reds and greens on two separate channels and I hardly use then except at midday. I'd make the fixtures a little bigger so the array of leds can do a better job of front to back coverage. And the biggest change I'd make is I'd have twice as many blue and violet leds as there are white... maybe even three times as many. Everybody runs their leds with the blue channel at 2 or 3 times the white channel. So why have so many white leds?