This is not exactly a C-30 modification, but is towed behind my C-30! Not wanting to spend cash on the flashlight-type of incadescent portable nav lights for my inflatable dinghy, I constructed bow and stern lamps using superbright red, green, and white LEDs and plumbing parts. They each use a 9V battery.
What a pain it is to try to mount these (or any) lights to an inflatable dinghy that doesn't have accomodations for such. My old Mercury PVC inflatable had a small rubber socket on the bow that nicely fit the 1/2" copper pipe; my new Mercury hypalon inflatable has no provisions! What were they thinking???
(If you are worried about the exactness of red and green colors, brightness, etc, this project is probably not for you.)