I think all you need is a fuse by your battery to prevent a short heating up a cable which can then start a fire or burn through your hull. That is mandated by ABYC and not doing so would be taking a silly risk. Even though the LEDs might draw only an amp, they will draw as much power as the battery can supply if they short out (i.e. get submerged in salt water or have a screwdriver accidently go across both terminals).