I just tried the light board in the video I posted above and it works from about 2.2-2.3 vdc to 12 vdc (didn't try any higher than that). The only thing is the flash rate (waterfall) goes faster at 12 vdc at the slowest setting. As would probably be expected with increased voltage.
I have ordered a bunch of the kits and although I have some diodes, I took advantage of one of the 100 packs too. There was a different kit with the PCB laid out a little differently that I got a few of also (can one ever have too many of these things?)
And Although it's probably over my head, I am going to look at GRJ's PCB layout and design program he posted above. I think that would be neat to be able to do, just in case I ever learn enough to actually make something on my own. Probably won't happen, but as the saying goes, even a blind hog gets a piece of corn every now and then. 
