Glow-pup

"Glow-pup" was the nickname for devices used in Federation shuttlecraft for emergency lighting. They were tubes of highly rarified ethon gas which were continuously excited by radiation, the power source of which had a half-life of twenty-five million years. In 2269, James T. Kirk, Spock and Montgomery Scott discovered that the shuttlecraft which Spock One had taken to Organia was lit only by the glow-pups.