Abstract: A conversion kit for boat running lights for converting a running light into a lantern for illuminating a boat's deck includes a conversion base portion coupling with an existing socket of a boat's running light. A conversion adapter portion is provided having electrical contacts with the conversion adapter portion being receivable through the conversion base and into the existing socket of the running light such that the electrical contacts of the adapter portion operationally connect with the contacts of the existing socket. The adapter has an upper socket portion extending upwardly therefrom for receiving a light bulb therein.