The original ironwork of the watch room and lantern at Diamond Head are still in use. The present tower, built in 1917, was constructed of reinforced concrete and stands 55 feet high. The original lighting equipment consisted of a 3rd order Fresnel lens and a special multiple-wick kerosene oil lamp, imported from France in 1899. These pieces of equipment were standard throughout the world for lights of this size and importance.
The first step in modernization at Diamond Head Lighthouse was to replace the fixed or steady light with the present day flashing light. Diamond Head Lighthouse has been progressively improved until today it stands as a modern automated USCG aid to navigation.
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