Is there any room for a plea against these things? Or at least against using them if anyone is around? Some of us are out there to enjoy natural beauty---stars, bioluminescence, aurora, etc., and underwater lights destroy that possibility.
And someone's comments about spreader/deck lights: those are a
safety advantage on some occasions, but one of the most important pieces of
safety equipment you have is your night-adapted vision. It takes dozens of minutes for your eyes to adapt to the dark, and less than a second of bright light to lose that all and have to start over. Spreader
lighting can be worth it in an
emergency, but it can also create or exacerbate an
emergency. The glare from your lights will interfere with anyone else trying to see other things.
Basically I guess I'm just begging you to remember that light pollution is pollution too. At least it's easier to clean up than chemical pollution...