The original British-made Chance Brothers first order Fresnel lens is still in use. However, the factory near Birmingham, England, where the lens was built, was bombed during war-time and the essential formula for making the unique lens crystal was lost, should a replacement ever be needed. The fixed-light lantern still lights the way for thousands of vessels using a combination of lighting colors. Under standard Australian lighthouse convention, red filters would usually be placed to the extreme left and right of the beam (indicating "danger zones" for a passing ship, in-line with the jagged coastline). For reasons unknown, the Split Point Lighthouse operated for a number of years under the opposite system; although this has now been corrected.