I'll throw my setup out there. I've got a 180g running full DIY led. I've got a mixture of LED's, as 2 of the lights were transitioned from my 46g bow to the 180g. I'm running 82 led's total, and am having great results so far.
My fixtures on the ends consist of 50/50 mix of XR-E Q5's. There are 17 on each fixture, and seem to do a great job. The 2 middle fixtures consist of XP-G's and XP-E's 50/50 mix again, and it's a little to white for my taste. It's a very crisp light, but I would prefer a little more blue. I'm running optics on the outer fixtures, none on the middle fixtures, and am having a bit of problem with the middle lights. The 1/2 glass center brace that Oceanic puts on thier tanks makes it very hard to get light through. I will be adding optics to the middles ones shortly.
Just a few pics.....although I don't think I have a full tank shot to post.
Left side of tank:
Right side of tank