Osram (Eur and Osram Sylvania NA) from 1993
4 character code
This calculator gives up to 2 possible options of what that date might be, depending on which decade the lamp was made in- you'll have to decide which one applies most closely to the lamp in question. All this does, is remove the need for you to do the maths of which code is which date.
This should be of the form letter-number-letter-number, or letter-3 numbers, and covers lamps made from 1993 onwards. I don't know the precise overlap with the old code system though.
It's important to enter the case of the letters exactly as on the lamp, as this will affect the result.
Info from an email by Colin Grimes to StreetlightingUK, May 2009.
This should be of the form letter-number-letter-number, or letter-3 numbers, and covers lamps made from 1993 onwards. I don't know the precise overlap with the old code system though.
It's important to enter the case of the letters exactly as on the lamp, as this will affect the result.
Info from an email by Colin Grimes to StreetlightingUK, May 2009.