Hey, my first post here. Are you still looking for beta's? I am building my LED array right now. I have 5/8 channels done and Ive already got some testing done with the ELN's and a Mega. A guy in NY sent me a shield to test for him and its working very well. Its outputs 10V that the ELNs need to Dim.
The only I see with yours, I havent read everything yet, but it seems it will only run 9 LEDs. Most of the decent ones for fish tanks are 3W, so 9*3W=27W.
I have a video I can send you of me just messing around with my array to get it to dim.
My tank is a 135g and Im using 42 XPG's and 42 XRE LEDs with 4XELN's.
The only real thing left for me is packaging and programing. The program, or sketch as its called, is kicking my butt. Thats what really brought me here, help with that.
O' and if you see the video, thats only my second day of having the mega in hand. Huge learning curve!!!