Hey guys, with my recent lamp haul, I have a lot of date codes I need help decoding. If anyone knows any of these please indicate the number next to the code and the deciphered date. Thanks a million!

WESTINGHOUSE LAMPS:
1. "1 0" Fully coated BT25 100W /DX
2. "9 8" BT25, /DX
3. "11" /C Phosphor cleartop 250W
4. "03" /DX Phosphor cleartop 250W

GENERAL ELECTRIC LAMPS:
5. "1 8" 100W/C Bonusline BT25
6. "56" 100W/DX ED23.5
7. "92" 100W/DX ED23.5
8. "14" 100W/DX ED23.5
9. "28" 400W Clear ED37
10. "16" 400W MH 3000K Coated ED37

SYLVANIA LAMPS:
11. "SR119" Clearbander 100W BT25
12. "SR116" Clearbander 100W BT25
13. "SR082" 100W ED23.5, /DX
14. "SR054" 100W ED23.5, /DX
15. "SR061" 100W ED23.5, /DX
16. "SR56" 70W HPS, clear ED23.5
17. "28" 100W /C Cleartop BT25 with White sleeve w/ red print

ITT (Sylvania-Made?) LAMPS:
18. "116" 250W /DX Cleartop, Girder Frame construction

Mike, I'll be happy to help. Here they come:

Hey guys, with my recent lamp haul, I have a lot of date codes I need help decoding. If anyone knows any of these please indicate the number next to the code and the deciphered date. Thanks a million!

WESTINGHOUSE LAMPS:
1. "1 0" Fully coated BT25 100W /DX - January 1980
2. "9 8" BT25, /DX - need more information is it fully coated? September 1978 if so
3. "11" /C Phosphor cleartop 250W - January 1971 nice find!
4. "03" /DX Phosphor cleartop 250W - October 1973

GENERAL ELECTRIC LAMPS:
5. "1 8" 100W/C Bonusline BT25 - June 1965 nice find
6. "56" 100W/DX ED23.5 - August 1968 or 1976 or 1984 need more info on sleeve and ordering code
7. "92" 100W/DX ED23.5 - June 1971 or 1979 or 1987 need more info on sleeve and ordering code
8. "14" 100W/DX ED23.5 - February 1973 or 1981 need more info on sleeve and ordering code
9. "28" 400W Clear ED37 - April 1974
10. "16" 400W MH 3000K Coated ED37 - April 1989

SYLVANIA LAMPS:
11. "SR119" Clearbander 100W BT25 - November 1980
12. "SR116" Clearbander 100W BT25 - August 1980
13. "SR082" 100W ED23.5, /DX - October 1987
14. "SR054" 100W ED23.5, /DX - June 1985
15. "SR061" 100W ED23.5, /DX - January 1986
16. "SR56" 70W HPS, clear ED23.5 - August 1985
17. "28" 100W /C Cleartop BT25 with White sleeve w/ red print - April 1973

ITT (Sylvania-Made?) LAMPS:
18. "116" 250W /DX Cleartop, Girder Frame construction - August 1970

Thanks Dave!

The westy is fully coated (so 1978) and I think all the GEs are "R" lamps, so probably '84, '87, and '81 for those?

BTW Dave, I got two more. Both 1000W lamps:

GE Bonusline /C. No date code on the etch but there's an "82" inkstamped on the neck of the lamp. Unfortunately the lamp is well used but I have a feeling it might be really old. Pre-'66 at least.

The other is an NOS Westy /DX with a "3" on top of an "O"