From International Dictionary of Marine Aids to Navigation
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Light-Centre-Length (of an incandescent electric lamp or discharge lamp)

The distance between the geometric centre of the luminous element and a specified plane of location on a cap.

Ch2 Fig27.jpg

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM