Underwater light too bright

Hey cool cats. My main underwater light is too bright. Even when it's dimmed all the way, it's just brighter than I wish it was.

I'm looking for a way to dim it just a bit. Ideally, some kind of waterproof adhesive sheet that diffuses the light? Or something similar. I'm not even for what kind of terms to Google to find something like that appropriate for a hot tub, lol.

Also, I know I'm asking in a stupid way. I guess I'm not wordsing very well, so hopefully you can figure out what I mean, lol.