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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:

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
$7.50
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 + + +
$7.50
LIONEL PARTS 53  12 16 VOLT BAYONET BASE BULB 10
LIONEL PARTS 53 12 16 VOLT BAYONET BASE BULB 10
$7.95
LIONEL 53 BAYONET BASE 12V 2 GREEN LIGHT BULB PRE POST WAR SMALL
LIONEL 53 BAYONET BASE 12V 2 GREEN LIGHT BULB PRE POST WAR SMALL
$1.95
LIONEL GE 55 BAYONET BASE 2 CLEAR BULBS POST PRE WAR LARGE
LIONEL GE 55 BAYONET BASE 2 CLEAR BULBS POST PRE WAR LARGE
$2.95
LIONEL PARTS 51  6 VOLT BAYONET BASE BULB 10
LIONEL PARTS 51 6 VOLT BAYONET BASE BULB 10
$7.95
433 18 VOLT BAYONET BASE LARGE GLOBE 5 R  5 G FOR LIONEL TRAINS MTH ++
433 18 VOLT BAYONET BASE LARGE GLOBE 5 R 5 G FOR LIONEL TRAINS MTH ++
$7.95
Lionel 363Y 14 Volt Yellow Bayonet Base Light Bulb
Lionel 363Y 14 Volt Yellow Bayonet Base Light Bulb
$1.05
Lionel 53 302 Lamp 14 v Green Translucent Bayonet Base
Lionel 53 302 Lamp 14 v Green Translucent Bayonet Base
$1.05
Acme 967 120 Volt Bayonet Base Tall Bulb
Acme 967 120 Volt Bayonet Base Tall Bulb
$2.10
Acme 44 63 Volt Bayonet Base Tall Bulb
Acme 44 63 Volt Bayonet Base Tall Bulb
$1.05
Acme 1000 3X Model Train Bayonet Base Lamp Socket
Acme 1000 3X Model Train Bayonet Base Lamp Socket
$1.05
Acme 1000 2X Model Train Bayonet Base Lamp Socket
Acme 1000 2X Model Train Bayonet Base Lamp Socket
$1.05
2445 Clear Small Round Head Bayonet Base Bulbs 24v 1 dozen
2445 Clear Small Round Head Bayonet Base Bulbs 24v 1 dozen
$9.95
1445 18 V BAYONET BRASS BASE SG MADE IN USA WORK IN LIONEL MTH
1445 18 V BAYONET BRASS BASE SG MADE IN USA WORK IN LIONEL MTH
$6.50
Lionel Trains Light Bulbs  1445 Bayonet Base 18 Volt Clear
Lionel Trains Light Bulbs 1445 Bayonet Base 18 Volt Clear
$10.00
Lionel Trains Light Bulbs  53 Bayonet Base 12 16 Volt Clear
Lionel Trains Light Bulbs 53 Bayonet Base 12 16 Volt Clear
$10.00
10 Pack of 55 light BULBS 7 VOLT BAYONET BASE for Lionel 6557 SMOKING CABOOSE
10 Pack of 55 light BULBS 7 VOLT BAYONET BASE for Lionel 6557 SMOKING CABOOSE
$9.99
257 flasher BULB 14 VOLT BAYONET BASE FOR LIONEL TRAINS MTH AF MARX + +
257 flasher BULB 14 VOLT BAYONET BASE FOR LIONEL TRAINS MTH AF MARX + +
$2.95
Lionel 1819 28V Bayonet Base Tall Globe Light Bulb 2
Lionel 1819 28V Bayonet Base Tall Globe Light Bulb 2
$1.04
257 flasher BULB 14 VOLT BAYONET BASE FOR LIONEL TRAINS MTH AMERICAN FLYER +
257 flasher BULB 14 VOLT BAYONET BASE FOR LIONEL TRAINS MTH AMERICAN FLYER +
$2.95
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
$3.50
LIONEL PART R 92 BAYONET BASE BULB LAMP SOCKET 2 NEW W46C
LIONEL PART R 92 BAYONET BASE BULB LAMP SOCKET 2 NEW W46C
$2.36
Lionel 153 50 Miniature Bayonet Base Round Red LampLight Bulb
Lionel 153 50 Miniature Bayonet Base Round Red LampLight Bulb
$4.99
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
$3.95
Lionel R 92 3 Prong Bayonet Base Lamp Socket
Lionel R 92 3 Prong Bayonet Base Lamp Socket
$1.25
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 PARTS 363  14 VOLT BAYONET BASE BULB 455 OIL DERRICK 10
LIONEL PARTS 363 14 VOLT BAYONET BASE BULB 455 OIL DERRICK 10
$7.95
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
$10.00
LIONEL PARTS 1445  18 VOLT BAYONET BASE BULB  10
LIONEL PARTS 1445 18 VOLT BAYONET BASE BULB 10
$7.95
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 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
$10.00
LIONEL BULB 433 18 VOLT CLEAR LARGE GLOBE BAYONET BASE  2 BULBS
LIONEL BULB 433 18 VOLT CLEAR LARGE GLOBE BAYONET BASE 2 BULBS
$1.60
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
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
$6.95


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