Partially for looks but primarily for night fishing. Ive never used the lights before so Ive never seen them in action but they are supposed to make certain monocilament lines nearly glow in the dark so that you can detect bites or line movement. I dont think they are really bright enough to actually light up the area that much but again Ive never seen them in action.Jim EbarbMany, LA (Toledo Bend Lake)2004 Cougar/ 225 OptimaxHumminbird Helix 12 Chirp SI on BalzOut Mount at bowLowrance HDS 7 at bowHumminbird Helix 12 Mega SI on Ram Mount at ConsoleLowrance HDS 8 in dash at console