I have an A8 and love the hot tub, but like you, I hate the lighting. I was thinking of getting a few remote control submersible LED pucks to put on the inside, but the reviews on those aren't that good either.
I do wonder why Bullfrog hasn't improved on this as people have been complaining about it for years. Years!
Maybe Bullfrog's approach is that adding more lighting means drilling more holes in the shell which they don't want to do because it means more potential leaks? IDK.
It's definitely frustrating though because you're paying a premium for a tub and you are getting less than entry level lighting. I mean there are $4k tubs that have better lighting than the Bullfrogs, so it's definitely an issue. I almost didn't buy a Bullfrog because of the lighting. I can't imagine I'm the only one that contemplated this. I do wonder how many sales they've lost though because of their inferior lighting.
If you find something that works let me know because I would definitely be interested in upgrading the lighting.