Independent reference · not a sales listing
Westinghouse 0400100
Westinghouse Lighting A15 40 Watt Medium Base Clear Incandescent Appliance Lamp
This is a 40-watt incandescent with a A15 envelope and E26 base. It produces 350 lumens. The listed light color is 2700 K warm white. No incandescent-equivalent claim is stored in the source snapshot.
View the official record ↗Source citation, not a buying link.Before replacing it
Five checks decide the fit
A shared base or wattage alone is not enough. Work down the list with the old bulb and fixture label in hand.
- 01
Socket
Match E26 exactly. The A15 code describes the bulb envelope, not the socket. Open the E26 base guide.
- 02
Electrical rating
The source lists 120 V. Confirm that against the fixture and local supply.
- 03
Brightness, not “watts”
Target about 350 lumens. The 40 W figure is input power, not brightness.
- 04
Physical clearance
The official maximum overall length is 3.38 inches. Check shade, cover, and neck clearance.
- 05
Heat, controls, and location
Enclosed-fixture use is not stated; it is marked dimmable; a wet/damp rating is not stated.
Normalized specifications
What the label says
These values are transcribed and normalized from the official source. A blank claim stays “not stated”; it is never filled by assumption.
- Manufacturer
- Westinghouse
- SKU / model
- 0400100
- Technology
- INCANDESCENT
- Shape
- A15
- Base
- E26
- Voltage
- 120 V
- Input power
- 40 W
- Incandescent equivalent
- Not stated
- Light output
- 350 lumens
- Color temperature
- 2700 K
- CRI
- Not stated
- Dimmable
- Yes
- Rated life
- 2,500 hours
- Beam angle
- Not stated
- Location rating
- Not stated
- Enclosed fixture
- Not stated
- Pack quantity
- 1
Useful next check
Nearby specification matches
Same E26 base and within 35% of 350 lumens. These are comparison leads, not confirmed substitutes.
0393000
A15 · E26 · 40 W
340 lm 2700 KWestinghouse0400200
A15 · E26 · 40 W
340 lm 2700 KFeit Electric40A15
A15 · E26 · 40 W
280 lm 2500 KFeit Electric40A15-130
A15 · E26 · 40 W
280 lm 2500 KFeit Electric40A15/CL-130
A15 · E26 · 40 W
280 lm 2500 KFeit Electric40A15/CL/2/HDRP
A15 · E26 · 40 W
280 lm 2700 KRead the specification in context
Use the record, then check the system
The label describes this lamp. These guides help connect it to the socket, room, controls, and other models from the same manufacturer.
E26 · Medium screw
E26 is the standard medium screw base used by most household bulbs in the United States. Base and bulb shape are separate specifications.
Open reference →Control guideDimmable vs non-dimmable LED
Read the bulb's claim separately from dimmer compatibility and fixture conditions.
Read guide →Color guide2700K vs 3000K vs 5000K
Understand how the listed color temperature changes the look of a room.
Read guide →Manufacturer indexMore Westinghouse model records
Compare verified models from the same official catalog snapshot by SKU, base, shape, power, and output.
Browse brand →Quick answers
Questions about 0400100
What socket does Westinghouse 0400100 use?
The official record identifies a E26 base. The replacement socket must use the same base code; a similar-looking bulb shape does not establish socket compatibility.
Is Westinghouse 0400100 dimmable?
Yes. The official record marks this model as dimmable, but the installed dimmer must also support the lamp technology and load.
Can Westinghouse 0400100 be used in an enclosed fixture?
The source snapshot does not state an enclosed-fixture rating. Do not infer one from shape or wattage; confirm on the bulb or manufacturer page.
BulbMatch stores factual fields for independent label and compatibility research. It is not affiliated with the manufacturer and does not sell this product.