Underwater Dock Lights

II’ve heard that green submersible dock lights are really popular for attracting snook and tarpon down in Florida. Has anyone here tried submersible lights off their docks or seen / fished any docks in our area that have the underwater green fish lights? If so, any luck with the Reds or was it mostly trout?

On a side note, when fishing a dock with lights where do you get the most fish? I typically cast up current lighted area and find that the strikes come once the bait reaches the shadowy areas. Wondering if I might have more luck setting up further back and fishing the dark areas behind the lights?