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Bayonet Base

Are all light bulbs the same size?

I feel so stupid asking this question. haha

How would I find the appropriate size?...Would the old bulb contain any clues?

No, but sometimes the actual size is not marked, but the standard code would resemble "60A19", that would indicate 60 watts, "A" is the standard bulb shape, and 19 is the diameter in 1/8ths of an inch.

For lamp sizes 100 watts or less size A19 or A21 are the most common (2 3/8 to 2 5/8"), A23 was the most common size before 1990.

Just for additional background this number format has some variation, and additional letters and digits are added to define the lamp.
For instance:

25B10C 25 watt, bomb shape, 10/8th (1 1/4), C is for candelabra base
25B10DC is same except double contact bayonet base
250T3Q is a tubular 250 watt quartz lamp
F32T8/3500k is a fluorescent 32 watt tube 1" diameter 3500 kelvin color temperature

Find Bayonet Base On eBay Below:

EIGHT 81445 18 V BRASS BAYONET BASE SG MADE IN USA WORK IN LIONEL MTH +
EIGHT 81445 18 V BRASS BAYONET BASE SG MADE IN USA WORK IN LIONEL MTH +
$7.95
LIONEL PART R 92 BAYONET BASE BULB LAMP SOCKET 2 NEW W46C
LIONEL PART R 92 BAYONET BASE BULB LAMP SOCKET 2 NEW W46C
$4.77
55 BULBS 7 VOLT LARGE GLOBE BAYONET BASE 4 LIONEL TRAINS 6557 SMOKING CABOOSE
55 BULBS 7 VOLT LARGE GLOBE BAYONET BASE 4 LIONEL TRAINS 6557 SMOKING CABOOSE
$4.50
Lionel part 24 VO 5A Light bulbs bayonet base
Lionel part 24 VO 5A Light bulbs bayonet base
$50.00
LIONEL REPLACEMENT LIGHT BULB LAMP 144V 100MA CLEAR BAYONET BASE 6000363300
LIONEL REPLACEMENT LIGHT BULB LAMP 144V 100MA CLEAR BAYONET BASE 6000363300
$9.84
Lionel L363R 53R Small Globe 14 V Bayonet Base Lamp Light 4 Ea Marx
Lionel L363R 53R Small Globe 14 V Bayonet Base Lamp Light 4 Ea Marx
$3.99
Lionel Trains Light Bulbs  363 Bayonet Base 14 Volt Clear
Lionel Trains Light Bulbs 363 Bayonet Base 14 Volt Clear
$11.95
431 14 VOLT BAYONET BASE LARGE GLOBE FOR LIONEL TRAINS MTH MARX AF + + +
431 14 VOLT BAYONET BASE LARGE GLOBE FOR LIONEL TRAINS MTH MARX AF + + +
$7.95
LIONEL MTH WILLIAMS 257 300 14 VOLT FLASHER BULB BAYONET BASE  2 BULBS
LIONEL MTH WILLIAMS 257 300 14 VOLT FLASHER BULB BAYONET BASE 2 BULBS
$1.85
LIONEL MTH WILLIAMS 257 14 VOLT FLASHER BULB BAYONET BASE  2 BULBS
LIONEL MTH WILLIAMS 257 14 VOLT FLASHER BULB BAYONET BASE 2 BULBS
$1.85
Lionel Trains Light Bulbs  51 Bayonet Base 6 8 Volt Clear
Lionel Trains Light Bulbs 51 Bayonet Base 6 8 Volt Clear
$11.95
Lionel Light Bulbs Large Globe RED Bayonet Base Lot of 10 new IOB 12 volt
Lionel Light Bulbs Large Globe RED Bayonet Base Lot of 10 new IOB 12 volt
$4.95
2445 24 VOLT BAYONET BASE SMALL GLOBE LOW HEAT LONG LIFE FOR LIONEL MTH
2445 24 VOLT BAYONET BASE SMALL GLOBE LOW HEAT LONG LIFE FOR LIONEL MTH
$7.95
Lionel Trains Light Bulbs Red  Green  53 Bayonet Base 12 16 Volt 10 Pcs
Lionel Trains Light Bulbs Red Green 53 Bayonet Base 12 16 Volt 10 Pcs
$13.95
Lionel 153 50 Miniature Bayonet Base Round Red LampLight Bulb
Lionel 153 50 Miniature Bayonet Base Round Red LampLight Bulb
$4.99
Ten 2445 Clear 24V Bulbs Bayonet Base New Tested Free Shipping
Ten 2445 Clear 24V Bulbs Bayonet Base New Tested Free Shipping
$6.95
2 TWO 1445 RED BAYONET BASE 18v BULBS for LIONEL
2 TWO 1445 RED BAYONET BASE 18v BULBS for LIONEL
$2.99
2 TWO 1445 GREEN BAYONET BASE 18v BULBS for LIONEL
2 TWO 1445 GREEN BAYONET BASE 18v BULBS for LIONEL
$2.99
1445 18 VOLT BAYONET BRASS BASE SG MADE IN USA FOR LIONEL MTH AND OTHERS
1445 18 VOLT BAYONET BRASS BASE SG MADE IN USA FOR LIONEL MTH AND OTHERS
$8.95
Lionel 363Y 14 Volt Yellow Bayonet Base Light Bulb
Lionel 363Y 14 Volt Yellow Bayonet Base Light Bulb
$1.10
2433 24 VOLT BAYONET BASE LOW HEAT LONG LIFE FOR LIONEL TRAINS MTH + +
2433 24 VOLT BAYONET BASE LOW HEAT LONG LIFE FOR LIONEL TRAINS MTH + +
$7.95
Acme 1000 1X Model Train Bayonet Base Lamp Socket w 20 Leads
Acme 1000 1X Model Train Bayonet Base Lamp Socket w 20 Leads
$1.10
TEN 10 53 14 VOLT BAYONET BASE SMALL GLOBE FOR LIONEL MTH  MARX + OTHERS
TEN 10 53 14 VOLT BAYONET BASE SMALL GLOBE FOR LIONEL MTH MARX + OTHERS
$7.95
FIVE 5 53 14 VOLT BAYONET BASE SMALL GLOBE FOR LIONEL MTH  MARX + OTHERS
FIVE 5 53 14 VOLT BAYONET BASE SMALL GLOBE FOR LIONEL MTH MARX + OTHERS
$6.50
431 14 volt Large Globe Bayonet Base Bulbs LK
431 14 volt Large Globe Bayonet Base Bulbs LK
$3.70
Lionel Trains Light Bulbs  51 Bayonet Base 6 8 Volt brass base clear
Lionel Trains Light Bulbs 51 Bayonet Base 6 8 Volt brass base clear
$9.95
57 Large Head Clear Bayonet Base Bulbs 12 16v 1 dozen
57 Large Head Clear Bayonet Base Bulbs 12 16v 1 dozen
$9.95
51 6 9 volt Small Globe Bayonet Base Bulbs LK
51 6 9 volt Small Globe Bayonet Base Bulbs LK
$3.70
10 total light bulbs 431 14 volt Bayonet base for Lionel A Flyer
10 total light bulbs 431 14 volt Bayonet base for Lionel A Flyer
$10.99
WAGNER 293 MB 10 PACK 12V LAMPS 2 CP BAYONET BASE MINIATURE BULB NOS
WAGNER 293 MB 10 PACK 12V LAMPS 2 CP BAYONET BASE MINIATURE BULB NOS
$6.95
AMERICAN FLYER LIONEL 1445RP BAYONET BASE LAMPS 18V 10 PER LOT MINT
AMERICAN FLYER LIONEL 1445RP BAYONET BASE LAMPS 18V 10 PER LOT MINT
$9.95
LIONEL AMERICAN FLYER  53 GREEN BAYONET BASE 144 V LIGHT BULBS
LIONEL AMERICAN FLYER 53 GREEN BAYONET BASE 144 V LIGHT BULBS
$4.80
Lionel L363R G 53R G Small Globe 14 V Bayonet Base Lamp Light 4 Ea Marx
Lionel L363R G 53R G Small Globe 14 V Bayonet Base Lamp Light 4 Ea Marx
$3.99
LIONEL 1445 18 VOLT REPLACEMENT SMALL HEAD BAYONET BULB CHROME BASE 3 NEW H47
LIONEL 1445 18 VOLT REPLACEMENT SMALL HEAD BAYONET BULB CHROME BASE 3 NEW H47
$4.88
10 1445 light bulbs 18 Volt made in USA Bayonet Base bulb for Lionel Trains
10 1445 light bulbs 18 Volt made in USA Bayonet Base bulb for Lionel Trains
$14.99
1445 18 VOLT BAYONET BRASS BASE SG MADE IN USA FOR LIONEL MTH AND OTHERS
1445 18 VOLT BAYONET BRASS BASE SG MADE IN USA FOR LIONEL MTH AND OTHERS
$4.95
Lionel part OL GE 53 Light bulbs bayonet base
Lionel part OL GE 53 Light bulbs bayonet base
$5.00
TEN 10 1445 18 V BAYONET BASE SMALL GLOBE FOR LIONEL MTH MARX AND OTHERS
TEN 10 1445 18 V BAYONET BASE SMALL GLOBE FOR LIONEL MTH MARX AND OTHERS
$7.95
1445 Clear 18v Small Head Bayonet Base Light Bulbs for Lionel Trains 6 Pieces
1445 Clear 18v Small Head Bayonet Base Light Bulbs for Lionel Trains 6 Pieces
$5.00
433 18 VOLT BAYONET BASE LARGE GLOBE FOR LIONEL TRAINS MTH MARX AF + + +
433 18 VOLT BAYONET BASE LARGE GLOBE FOR LIONEL TRAINS MTH MARX AF + + +
$7.95


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