Wild guess here, but likely... About a couple miles off shore along the mid-section of Ali'i drive there's a FAD (fish aggregation device) bouy. These generally are lighted themselves. There's a type of fishing, called "ika shibi" (something like that anyways), that is popular locally, where fishermen will go out to the bouys late at night, put out a sea anchor (it's basically a parachute) that will put them locked into the local current rather than being pushed by the wind. Some time in the middle of the night, after a couple hours of chumming, they'll put lines in the water and hope for the best. It's one of those things that you can do for several nights and catch nothing, then one night run into a school of tuna and load up. Often times several boats will do this and you'll have a line of lights in the same area on those nights. Odds are you've got a bunch of fishermen that are giving it a go.