We do a lot of night fishing here and the approximate cost is somewhere around $250 including the best blacklight plugs available. The only visible evidence is 4 small receptacles in the top cap. I also have lights in my rubrail, but the performance is no where close to the MoonLite drop-in lights. The plugs alone are $100 for 4. If you are interested in some plugs and/or lights, feel free to call me at 423-773-7000. A local guy that I know manufactures the “MoonLite” compact LED blacklights and plugs. They are incredible quality and have a large following. If I can help, let me know. Thanks…Ben