Compared to its 50-watt halogen competition, the Attwood underwater lighting draws only a fraction of the power (less than 1A) while producing a significantly brighter output. Attwood's underwater light is unmatched in ease of installation, and doesn't require a large through-hull cutout below the water line. With only a small hole for wiring, and two 8FHSS screws on 4" center (not included) for attachment, Attwood's LED surface mount design makes installation quick and effortless. Ten-year LED warranty. 5.7"L x 1.7"W x .7"H.