After comparing far more LED units than I originally considered, I'm fairly confident that I'll be going with the GHL Mitras. I've organised to see the model on demo this weekend at my LFS.
In terms of the variety of LED colours and the degree to which they can be controlled, I feel that the Mitras comes out on top.
I ruled out the Radion XR30w Pro due to the layout of the LEDs and because of the known issue with moisture laden air being drawn up into the fixture. So it was a competition between the GHL Mitras, Vertex Illumina, Maxspect R420R and Illumagic Blaze.
Maxspect was taken off the table due to the layout of the LEDs and lack of control, as it only has 6 'Time-Points'. It also limits in terms of the achievable colour 16K or 10K, and all the LEDs each channel are adjusted simultaneously. This means that CW and WW are one channel; with B, RB and UV ('Super Actinic') on the second.
The Vertex was a prime candidate, however the need to add a centrally mounted UV and R pad took it down a notch. This reduces the true spread of the UV and R LEDs to the centre of the tank, which would mean I'd likely have to buy a more expensive 2ft unit rather than the reccomended 1ft.
Illumagic looked great, but when I compared the number and variety of LEDs, controllability and the benefit of a slimmer pendant style fixture; the GHL seemed to come out on top.
@
leodb89 I saw your tank journal update and was very impressed.
What are people's thoughts on the shadowing issue with Acropora under LEDs? From what I read the single directional light emitted by LEDs means Acropora sp. will colour up on the top and not around the sides. This isn't an issue with T5 or MH as the reflectors send light from multiple angles.
I figure the only way around this is to use a hybrid fixture. But that makes me wonder why it would be necessary to upgrade to LED in the first place. A retrofit to my existing T5 fixture would achieve the same end.
It's a lot to digest.