 The Flagstaff light was replaced by the Lighthouse in 1903 by Riley, Hargreaves & Co., who in 1909 combined with another company to form United Engineers that is still present to this day at nearby River Valley.The light was created by a burner fuelled by kerosene, which generated 20,000 candlepower and itself was dioptric occulting type.The light was "eclipsed" (darkened) every 17 seconds by lowering a metal cylinder around the burner for 3 seconds, thus giving rise to the term
"occulting type".