The SeaFloor Series of underwater lights are our "anchored to the bottom" style lights. This means the light fixture floats so a weight is required to hold the light in the desired location and depth. \n \nThe SF100B comes with a 50-foot cord, a 120v to 24v power supply to provide safe current to the light and an array of high output, blue LEDs for maximum output and energy efficiency. Designed to be deployed so the light fixture is floating about 3 feet below the surface. Because there are no special transformers, ballasts and other parts, there is no need for an electrician. Simply attach a small weight (about 2 pounds) on the cord, drop it in the water and plug it up. \n \nInstallation takes about 5 minutes. As with all our dock lights, we recommend turning off any other white lights on the dock. You will be amazed at the amount of fish you will see with the SF100B. Safe low voltage current, very bright and energy efficient best describes the SF100B, a truly green product.