Abstract: A self-powered lighting system that mounts to an electrosurgical pencil that is used to cauterize human tissue during a medical surgical procedure. The self-powered lighting system of the present invention illuminates the affected region during the medical procedure and is uniquely configured to meet the strict water-proofing and sanitizing requirements of a surgery room setting. The self-powered lighting system of the present invention is powered by a simple rotation of a main body relative to a lens cover to connect a battery to a light source that emanates light. The lens is shaped to properly distribute and direct the light to the affected region.