Independent reference · not a sales listing
Westinghouse 0391800
Westinghouse R40 125 Watt Medium Base Incandescent Lamp
This is a 125-watt incandescent with a R40 envelope and E26 base. It produces 550 lumens. The listed light color is 2400 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 R40 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 550 lumens. The 125 W figure is input power, not brightness.
- 04
Physical clearance
The official maximum overall length is 6.5 inches. Check shade, cover, and neck clearance.
- 05
Heat, controls, and location
Enclosed-fixture use is not stated; dimming is not stated; 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
- 0391800
- Technology
- INCANDESCENT
- Shape
- R40
- Base
- E26
- Voltage
- 120 V
- Input power
- 125 W
- Incandescent equivalent
- Not stated
- Light output
- 550 lumens
- Color temperature
- 2400 K
- CRI
- Not stated
- Dimmable
- Not stated
- Rated life
- 5,000 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 550 lumens. These are comparison leads, not confirmed substitutes.
G2560S2/5TSWF/HDRP
G25 · E26 · 5.5 W
500 lm 2200/2700/3500/4000/5000 KFeit ElectricSPIRAL5CCT/MB/HDRP
Specialty · E26 · 5.5 W
500 lm 2200/2700/3500/4000/5000 KFeit ElectricST60S2/5TSWF/HDRP
ST19 · E26 · 5.5 W
500 lm 2200/2700/3500/4000/5000 KFeit ElectricT1060/5TS/WF/HDRP/2
T10 · E26 · 5.5 W
500 lm 2200/2700/3500/4000/5000 KFeit ElectricT10L60S2/5TSWF/HDRP
T10 · E26 · 5.5 W
500 lm 2200/2700/3500/4000/5000 KFeit ElectricT10XL60S2/5TSWF/HDRP
T10 · E26 · 5.5 W
500 lm 2200/2700/3500/4000/5000 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 →Color guide2700K vs 3000K vs 5000K
Understand how the listed color temperature changes the look of a room.
Read guide →Code guideWhat bulb letters and numbers mean
Separate shape codes, base codes, dimensions, and electrical ratings on the label.
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 0391800
What socket does Westinghouse 0391800 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 0391800 dimmable?
The source snapshot does not state a dimming rating. Treat dimmer compatibility as unconfirmed.
Can Westinghouse 0391800 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.