In 1968, the installation of a 4th Order electrically operated revolving optic replaced the original 2nd Order optic with a pressurised vapour kerosene "Hood" mantle burner. The light source was changed to a 100-volt/1,000-watt incandescent bulb producing 350,000 candelas of light intensity with a visibility range of . The power supply came from one of the three generators installed in a generator room built close to the keeper's room. As the rotation was electrically driven by motors, the crew was reduced to four men.