Aluna Systems is a manufacturer of high reliability Aluna Light Pole ™ navigation lights. Are you frustrated with plug in stern lights that don't work when you need them? Corroded electrical contacts again? Coventional removable stern lights work when they are new. But after a short time exposed to water (especially salt water) the contacts corrode. Sonner or later when you go to use it, no light. Aluna Light Pole ™ technology is a patented light conduit technology that replaces electrical contacts with light coupling. There are no electrical contacts to corrode and the removable light pole contains no electrical components. The LED light source is encapsulated in the plug base and is waterproof. Light coupling is impervious to salt water and even works under water. Try that with conventional plug in navigation lights. Aluna Light Pole ™ - reliability in light.