Fourth order Fresnel lense in situ in the Elizabeth Donkin lighthouse, Port Elizabeth, South Africa. The lighthouse was built in 1903 replacing an earlier wooden structure and decommissioned in 1973.Elizabeth Donkin Lighthouse, Lighthouse fans The lighthouse balcony is 21.6 m above ground level and 75.6 m about sea level. The glasses on the lower support give an indication of the size of the lens.