Updated 02-X-2022

Lamp Classification
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Photo-Optic Lamps
American National Standards Institute ANSI Codes (3-letter format)
British Lighting Industry Federation codes for Class A1 Projection Lamps
British Lighting Industry Federation codes for Class A3 Horizontal Projection Lamps
British Lighting Industry Federation codes for Class B1 Floodlighting Lamps
British Lighting Industry Federation codes for Class B2 Floodlighting Universal Lamps
British Lighting Industry Federation codes for Class CP Colour Photography Lamps
British Lighting Industry Federation codes for Class D Lighthouse Lamps(superseded by Class L)
British Lighting Industry Federation codes for Class DC Document Copying Lamps
British Lighting Industry Federation codes for Class E Episcope & Epidiascope Lamps
British Lighting Industry Federation codes for Class F Microprojection Lamps
British Lighting Industry Federation codes for Class FL Floodlighting Horizon Lamps
British Lighting Industry Federation codes for Class G Exciter Lamps
British Lighting Industry Federation codes for Class H Marine Searchlight Lamps
British Lighting Industry Federation codes for Class J1 Airfield Signal Lamps
British Lighting Industry Federation codes for Class K Halogen Floodlight Lamps
British Lighting Industry Federation codes for Class L Lighthouse Lamps (formerly Class D)
British Lighting Industry Federation codes for Class M Miscellaneous Projection Lamps
British Lighting Industry Federation codes for Class P1 Photoflood 3400K Lamps
British Lighting Industry Federation codes for Class P2 Photoflood 3200K Lamps
British Lighting Industry Federation codes for Class P3 Photographic Enlarger Lamps
British Lighting Industry Federation codes for Class P4 Photo Variable Colour Lamps
British Lighting Industry Federation codes for Class R Ribbon Filament Lamps
British Lighting Industry Federation codes for Class S Studio Incandescent Lamps
British Lighting Industry Federation codes for Class SL Railway Signal Lamps
British Lighting Industry Federation codes for Class T Theatre Lamps

Industrial Codes
Thorn Lighting UK - Class AF - Airfield Lamps
Thorn Lighting UK - Class GH - Miniature Glass Halogen Lamps
Thorn Lighting UK - Class HH - Halogen Heat Lamps
Thorn Lighting UK - Class HX - Halogen Experimental Lamps (Leicester)
Thorn Lighting UK - Class THE - Tungsten Halogen Experimental Lamps (Enfield)
Trinity House Corporation UK - Class EC - Engineering Chief's Lighthouse Lamps

Military Codes
British Admiralty codes (format AP.xxxx)
British Air Ministry codes (format 5L/xxxx)
British Government Department of the Environment codes (format EL/xx)
NATO Inter-Service codes (format 6240-99-99x-xxxx)