Note *Long Response*
Not to sound like a bad person, you can use the search function. There are SO many threads on LED's it's getting absurd especially because most of the answers/responses are the same.
Anyway, onto the response.
First thing, I know it is difficult to find lighting for a corner tank because of it's funky dimensions (I used to have one).
Anyway, here's what you have to ask yourself.
1. What are you going to keep?
2. What's your budget?
3. How's your aquascaping going to be (where are your corals going to be placed?)
4. Do you care about appearance (you said it's in a canopy so I guess not.)
So my question with the Acan Light is can it cover the depth from the outside oval of the tank to the end? Not sure how deep the Acan Light is and what Optics options you are going for. Which Acan Light? -- outputs are different on them.
You can check out other LED Brands:
Maxspect LEDs, Pacificsun LEDs, Sunbrite Systems, Aquaillumination, EcoRay, Blue Moon Aquatics, Ecoxotic, Coral
Sky LED, Evil66 PAR38 bulbs, Orphek LEDs, and Doing It Yourself
Here is a great article Prattreef posted in another thread:
http://www.reefsmagazine.com/showthread.php?t=82622