Lamp Date Calculators
The calculators below are compiled from information gleaned from discussions on the streetlighing lists, also information I've been able to find out by trial and error.
No lamp date calculator can give the whole picture when trying to find out the age of an old lamp, reference to catalogues and people who are knowledgeable about this sort of thing are usually necessary too. Hopefully these calculators will aid the process.
I've done these calculators with all the info available to me, however they might produce an incorrect result sometimes- let me know if you think this is the case, and I'll try and correct the problem.
If the calculator doesn't like the date code you entered (be careful with using lower case where it should be capitals) it won't spit anything out.
More may be added if the info becomes available.
Credits for the folks who helped out is on the individual pages.
No lamp date calculator can give the whole picture when trying to find out the age of an old lamp, reference to catalogues and people who are knowledgeable about this sort of thing are usually necessary too. Hopefully these calculators will aid the process.
I've done these calculators with all the info available to me, however they might produce an incorrect result sometimes- let me know if you think this is the case, and I'll try and correct the problem.
If the calculator doesn't like the date code you entered (be careful with using lower case where it should be capitals) it won't spit anything out.
More may be added if the info becomes available.
Credits for the folks who helped out is on the individual pages.
Click for the calculator page
- Thorn/Atlas
- 2 digits
- Mid 1960s to 1990s (from 1958 for AEI)
- Try for Thorn, Atlas, BTH, AEI Mazda
- Osram / GEC (UK)- 2 letter code
- 2 letter code
- 1945 to 1990s
- Try for Osram GEC, Cryselco
- Osram / GEC (UK)- 2 digit code
- 2 digit code
- 1934 to mid 1960s
- ELMA code- try for early (pre 1965) BTH, Mazda, Philips
- Osram (Eur) - 3 character code
- 1960 to 1993
- Try for Osram, Wotan
- Osram (Eur and Osram Sylvania NA) - 4 character code
- 1993 to present
- Try for Osram, Sylvania (North America and European)
- Sylvania (NA) - 3 digit code
- 1961 to present
- North American lamps only, with or without the 'SR' prefix
- Philips (Eur/NA)
- 1960 to present
- 2 character code (letter-number or number-letter)
- Try for all newer Philips lamps, also some Crompton lamps have this code