Thanks, I really like your design as-well. I think I watched your video 10xtimes, in order to come up with my design.
The kit I purchased did not come with a dimmable option, I might in the future go for it. In regards to the optics I think your right, I'll probably keep optics on the "angled LEDs" to try to "push" as much light as possible into corners of the tank.
Thanks! Life would be boring without mods and DIY!
I'm handy enough to tackle my own plumbing and electrical around the house (to a point), but the kind of stuff I see here is totally beyond me, LOL! Heck, I can't even seem to get the rim off my 20L . . .
LEDs die by being overcurrent and of course how many hours they are driven, since these have a MTBF of 50K hours you will grow old and gray before they crap out, so no worries if you did not dim them. Dimming only gives you latitude on intensity, and of course dusk to dawn effect.