I used strip leds under the rubrail on an 82 champion 184.
got some real 3m 1/4" tape and put it down first, a lot easier to work with and way better than the factory sticky on the lights. peel a foot or 2 of the red plastic to set leds and it is pretty easy. had about 40-50 yds. vision on both sides when night fishing.
these were just waterproof off of amazon, 16' strips. one 1/8" hole under the rail for tiny wires, be carefull when stripping them. guessing this is what you mean by spreader lights.