Lumitec Mantis Underwater Add-On Light

The Lumitec Mantis Underwater Add-On Light expands your existing Mantis dock lighting system by adding a fourth light fixture to your installation. This add-on light module integrates seamlessly with the standard three-light Mantis kit, allowing you to extend underwater illumination coverage across larger dock areas, boatlifts, or multi-slip facilities. Each Lumitec Mantis kit supports up to four total lights maximum—purchase additional complete kits if you need more than four fixtures.

This add-on package arrives complete with all necessary mounting hardware, Zip-Mount ties, and pre-cut cabling required for installation. The modular design means no additional power supply or control system is needed—the add-on light connects directly to your existing Mantis system wiring. Weighing 4.75 lbs and measuring 12 x 4 x 12 inches, the fixture is compact enough for tight dock spaces yet delivers output consistent with the standard Mantis lineup. The underwater design is engineered to withstand saltwater environments and repeated freshwater cycles without corrosion or lens degradation.

This light suits boaters who initially installed a three-light system but later realized they needed broader coverage—common when dock layouts expand, additional slips are added, or shallow-water fishing zones require better visibility. It's also ideal for security-minded dock owners looking to increase nighttime illumination without running separate power circuits. Because the Mantis system uses a single integrated controller, upgrading from three to four lights requires only unpacking the add-on and connecting it into the existing harness.

The four-light maximum per kit is a practical boundary set by Lumitec's control architecture. If your dock or facility requires more than four lights, you'll need to purchase a complete second Mantis kit with its own controller and power supply, then position the two systems to cover separate zones. This modular-kit approach gives flexibility without overcomplicating a single control unit.