I'm not saying 5mm LED's are great but I was planning on making a 5mm array with drivers and all. It was a 1400 LED panel. Each LED about 6000mcd so a lot of lumens (but not as much compared to high power though). My design would probably have worked pretty well, probably alot better than yours however (not shit talking but I don't think yours is the best 5mm LED panel). I designed the circuit board and everything with a computer program. Ill try to load pics. I can give you files if you want to explore that path. 5mm are VERY cheap so you could have a real kick-ass 5mm panel for about $40.