Each Green Glow Dock Light HID Lamp Kit is individually and meticulously hand crafted using a three step state of the art water sealing process. This quality workmanship creates a superior product and ensures dependability in the harsh underwater environment.We build both Single and Double HID (High Intensity Discharge) underwater dock light systems. All with 50’ length heavy marine grade lamp cords. (You will only be disappointed with anything shorter. You would rather have an extra 10' of cable than be 5 or 10 feet short). We also offer replacement HID Bulbs units for all our underwater dock lights and many other HID systems.