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krypton incandescent - automobile lamp light bulb
4057 LONG-LIFE 12.8V 14V 2.23A 0.48A USA
donsbulbs part:
K4057W2.5Q USA
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/CL/4000H/10000H
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K4057W2.5Q USA
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/CL/4000H/10000H

bulb specifications:
  
category: Krypton incandescent - automobile lamp
volt: 12.8 / 14
amp: 2.23 / 0.48
watt: 28.5 / 6.72
base: W2.5x16q
glass: S8
filament: C6
fil.res.: 5.74 / 29.2 ohm
i.lumens: 402 / 25.1
cp: 32 / 2
d.hours: 4000 / 10000
notes: base:grey amodel
clear glass
extended service (long life)
code:ll
krypton gas


typical shape of S8 glass envelopes
(not to scale)


typical shape of C6 filament
(not to scale)


industry standards for base:
W2.5x16q
(not to scale)


Don's grand wisdom: When multiple bulbs are in a circuit; if one bulb burns out, you really should replace all bulbs at same time. This way all bulbs will look the same. Otherwise, mixing "used" bulbs with "new" bulbs (or mixing brands) will each look different (some will be dimmer, some a different shade of color.) For example, automobile headlights and tail-lights must always be replaced in pairs or they will look odd. And, when one bulb is at it's end of life, the other will be near it's end of life too. Keep good working "used" bulbs as emergency spares.

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Definition of light bulb refers to lamp.
Definition of socket refers to lampholder (lamp holder).


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K4057W2.5Q USA
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/CL/4000H/10000H

also known as
Cross-Reference:


4057-KRYPTON USA
4057/K/12V/32CP/2CP CANDLEPOWER-INCORPORATED
4057/K/12V/32CP/2CP USA
4057/KRYPTON/12.8V/14V/2.23A/0.48A USA
4057/KRYPTON USA
4057/LL/12.8V/14V/2.23A/0.48A/W2.5X16Q USA
4057/LL/12.8V/14V/2.23A/0.48A USA
4057/LONG-LIFE/12.8V/14V/2.23A/0.48A USA
4057K/12V/32CP/2CP CANDLEPOWER-INCORPORATED
4057K/12V/32CP/2CP USA
4057K CANDLEPOWER-INCORPORATED
4057K SYLVANIA
4057K USA
4057LL CEC
4057LLBP CEC
K4057W2.5Q USA
KRYPTON/12V/28.5W/6.7W/W2.5X16Q/S8/4000H/10000H/4057K USA
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/10000H
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/CL/4000H/10000H/K4057W2.5Q USA
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/CL/4000H/10000H K4057W2.5Q USA
KRYPTON/12.8V/28.5W/6.7W/W2.5X16Q/S8/4000H/10000H/4057K USA
KRYPTON/12.8V/28.5W/6.7W/W2.5X16Q/S8/10000H
KRYPTON/12.8V/28.5W/6.7W/W2.5X16Q/S8/10000H/4057K USA
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K4057W2.5Q USA
KRYPTON/12.8V/14V/2.23A/0.48A/W2.5X16Q/S8/CL/4000H/10000H

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manufacture name:  Bell & Howell
model number #:  1480
model name:  Multi-Motion
size:  8mm
type of equipment:  projector
notes:  only the green one
comments:  any comments