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GE Date Codes

GE Date Codes

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The date codes have baffled me for a long time so I began reverse engineering them and this is what I have discovered so far. The dots indicate the month of manufacture. They are counted right to left starting at the letter "T" in "Electric" all the way to "G" in General. One dot under T is December, two dots under C and T is November up to 12 dots as in the pictured lamp which is January. The dashes indicate year of manufacture. Unlike the dots, there is only one dash and it is counted left to right starting at the letter G in general ending at the 2nd E in electric. G indicates a "1" ...1971, 1981, 1991. A dash under the "E" in general indicates a "2"... 1972, 1982,1992. All the way down to the 2nd "E" in electric which is a "0"... 1970, 1980,1990. The pictured lamp was made in January 1972 or 1982...etc.

Any one that knows what the other dash means please chime in. I'm guessing it indicates the factory or country of manufacture.


The other 8 dot code is not that obvious.. But I am working on figuring out that one as well...

E8DEBCFF-72BD-4F30-9F1E-F4836658A11F.jpeg 57B368BA-B15F-4091-B4C1-9A1763A2B814.jpeg A156582D-7464-4623-A377-BE1D1C6CF1DE.jpeg 5480F061-BC82-41D5-9F70-AA0C145C428F.jpeg

Light Information

Light Information

Manufacturer:GE

File information

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fluorescent lover 40
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Lights are awesome! :)


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May 04, 2019 at 07:39 AM Author: fluorescent lover 40
Right on all accounts. The other dash indicates factory. Etch design and punches in the endcaps can determine the decade as well. This was made January 1972 or 1982 at the Circleville, Ohio plant. How many punches are in each endcap?

Current: US 120v 60hz
Power provider: Southern California Edison (SCE)

-Date decoder of some US lamps 1960-present.
-I'll save any vintage lamp... dead or alive! Smiley

ultralume
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May 04, 2019 at 08:03 AM Author: ultralume
Interesting date code. Easy to figure out just by looking
James
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May 04, 2019 at 11:14 AM Author: James
In addition to the well-deciphered above date code, the factory denotions can be found here.
ultralume
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May 04, 2019 at 05:40 PM Author: ultralume
Ok good to know. I don't get it.. If the date codes are such a well guarded secret...why are the date codes tables online?
James
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May 05, 2019 at 03:44 AM Author: James
I don’t think its a well guarded secret any more! All the big lighting companies have sold out their businesses because it is no longer profitable since the transition to LED, and these codes mainly relate to obsolete products of no commercial value.
Cool white 79
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May 05, 2019 at 08:29 AM Author: Cool white 79
I wonder why it was a secret to begin with. Im guessing it was to guard against knowing how long the lamp lasted compared to other manufacturers??
Bluesvan
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May 07, 2019 at 06:51 PM Author: Bluesvan
This is very informative. Thank you. I would like to understand Sylvania date codes better too. I know the Philips ones use a number and a letter for the year and the month.
ultralume
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May 07, 2019 at 08:24 PM Author: ultralume
Bluesvan, if you scroll up through the messages andfollow the link James sent me, you will get to a site that may help you with the Sylvania date codes. It's there just look around
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