This might sound goofy (redneck) but I was thinking about taking one of those solar powered lights that you put in your yard, and figuring out a way to waterproof them a little better (might not need to, they are for outside), and maybe painting the lense green/red. No wiring, and inexpensive. Because they are on a stick, they would stand up higher. I would drill a hole through the end of the stick sideways, then put a pin through the front lifting lug on my TI to pin it to the bow lifting lug so it stands straight up on the bow. I never plan to go out at night normally, but there have been times I've been out after dark (when the dang wind died, and you have to pedal/paddle back in).
I have a couple of those white lights on a stick with a suction cup that I keep in the hull which work ok as long as you remember to keep fresh batteries in them (finding a place for the suction cup to stick is another matter).
If out after dark I typically put one on the back of the boat, and the other I put up near the cockpit so I can see, but I invariably end up staring at it, and wrecking my night vision ( LOL), but it does light up the sail so I can be seen.
I always pack a good LED flashlight in my drybag so I can look ahead for markers when it's really dark (no moon). My backup Led flashlight also has a hand crank (and weather radio) so I can re-charge by cranking it (handy but far from waterproof). You also have something handy in your hand to throw at them if a drunk go fast powerboat wizz's by too close (if you have anger management issues LOL). If I see a boat approaching I shine my flashlight on my sail just to make sure they see me.
At least in Florida, I think you only need the white light near the stern on a kayak at night, the green red lights might be overkill, but I'm no expert.
If you go out at night quite a bit it probably wouldn't hurt to put reflective tape around the boat, they might even have green and red that you could put strips on the left and right sides of the bow instead of green red nav lights (just a thought), something like this ( http://www.uline.com/BL_6350/Reflective ... paign=Tape
Sarasota is the go fast boat capital (Cigarette boats) so I worry about these things (especially around spring break time). I'm not allowed (by wife) to even take my kayak out during offshore race week (around July 4th).
PS that flashlight inside the hull idea is a good idea ( an indiglow boat 'cool').
Hope this helps