SCM-4 LED Underwater Light w/20' Cable - 316 SS Housing - Aqua Green. With four LEDs, this compact underwater light is the perfect addition to every vessel. Available in any of our five colors, the SCM-4 works with our Wireless Controller and Power Distribution Box for ease of use and installation.. High Intensity. Shadow-Caster underwater LED lights are designed to deliver the most intense optical output. Our unique design allows us to produce maximum light output and maximum LED life (over 40,