I bought a pair of cheap auxiliary lights at a farm store. They came with two lamps, a switch, and some wire.
The boat already had fat wires to the front for a trolling motor. All I needed to do was add a relay and wire it.
Later on I built a plywood box to surround the lights. Protects them from sticks as you can see in this video.
These lights work good enough that I can get through that mess in the dark without using a spotlight at all. They cost me $20.