There are three parts to the Docking light question. Lighting the dock while approaching it, Keeping it out of other boaters eyes, and lighting the pier after arrival.
The answer is to mount a movable light up very high and point it down.
I have a had held light that works as long as I can get someone else to point it where I request.
Your Post has me looking at the
RAM-B-152 Spot light.
I don't have any part of the boat that is over my head while standing, but the Windshield frame is an option.
I anticipate fabricating a clamp to hold it to the frame for night use, and storing it when not needed. Clean and neat.
I already have a windshield frame clamp that I use to mount a Mirror to monitor the Skiers/Tubers during water sports.
Mounting it high would allow pointing it down in front of the bow and the ball joint would allow lighting the Pier during unloading.
Mounting it on the Windshield near the helm would allow adjusting it without assistance.
Plus it could be pointed aft if needed for engine repairs or dismounted and hand carried anywhere in the boat.
The bulb is a standard replaceable PAR-36 bulb available in 1600+ lumen LED versions.