The ones I have are SurfStow SUPglow, but there are a lot out there. They run on AAA batteries that actually last a good while:
http://smile.amazon.com/SurfStow-Supglo-...ywords=surfstowThey attach to the bottom of the board with heavy duty suction cups, so you could really mount them on any smooth surface, though I wouldn't leave them mounted on a boat while you're underway, of course
Felix