El Z: I have 2 sets that you can borrow, they are both nite riders. the 10W only burns for about 1:20, and I use it on the helmet. The other set is 15 watt and has 2 batteries, one for a water bottle holder and the other you can use for a helmet set or strap to your bike. both batteries have pretty decent burn times (3 plus hours). let me know if you are interested, and we can take this to PMs.
Caveat, I am Norm's support crew for the night leg of the race. So he gets first dibs.