If you're going for lights you can get a battery operated port/starboard light for the bow (just mount it on one of the bows) and to show you're a sailboat you will need a battery powered masthead light and a white stern light. I would still carry a searchlight/flashlight like I mentioned in my earlier post to shine on the sail. You can't assume every yahoo in the dark will know that a white masthead light indicates a sailboat. Night sailing is also a good excuse for buying a small air horn and three flares.