A flashlight is all that is required http://www.ncwildlife.org/Portals/0/Boating/documents/VOG/InlandLightingRules.pdfI believe you are suppose to have a visibility light on all the time 360 degree visible plus a pointable light. Don't forget the whistle and pfd and you are legal.
I like this idea a lot. I think I might make a PVC flag pole with one on top. Sit it in a holder and forget about it.I talked to a guy that configured a dollar store pathway light. leave it out during the day and it will last a good six or so hours after dark. It's bright enough to be seen, has 360 coverage and doesn't blind you. take an extra battery just in case. Be safe, be seen.