Independent reference · not a sales listing
Westinghouse 0478100
Westinghouse MR16 20 Watt GU5.3 Base Halogen Low Voltage Lamp
This is a 20-watt halogen with a MR16 envelope and GU5.3 base. It produces 180 lumens. The listed light color is 2950 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 GU5.3 exactly. The MR16 code describes the bulb envelope, not the socket. Compare base profiles.
- 02
Electrical rating
The source lists 12 V. Confirm that against the fixture and local supply.
- 03
Brightness, not “watts”
Target about 180 lumens. The 20 W figure is input power, not brightness.
- 04
Physical clearance
The official maximum overall length is 1.81 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
- 0478100
- Technology
- HALOGEN
- Shape
- MR16
- Base
- GU5.3
- Voltage
- 12 V
- Input power
- 20 W
- Incandescent equivalent
- Not stated
- Light output
- 180 lumens
- Color temperature
- 2950 K
- CRI
- Not stated
- Dimmable
- Yes
- Rated life
- 2,000 hours
- Beam angle
- 32°
- Location rating
- Not stated
- Enclosed fixture
- Not stated
- Pack quantity
- 1
Useful next check
Nearby specification matches
Same GU5.3 base and within 35% of 180 lumens. These are comparison leads, not confirmed substitutes.
0474900
MR16 · GU5.3 · 20 W
180 lm 2950 KFeit ElectricBPBAB/3CCTCA/3
MR16 · GU5.3 · 2.6 W
200 lm 3000/4000/5000 KFeit ElectricBPBAB/930CA
MR16 · GU5.3 · 2.6 W
200 lm 3000 KFeit ElectricBPBAB/930CA/3
MR16 · GU5.3 · 2.6 W
200 lm 3000 KFeit ElectricBPBAB/CG/3
MR16 · GU5.3 · 20 W
230 lm 3000 KFeit ElectricBPBAB/CG/3/HDRP
MR16 · GU5.3 · 20 W
230 lm 2800 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.
GU5.3 · compare base profiles
Use the visual base atlas to compare screw diameter, pin spacing, and locking style.
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 0478100
What socket does Westinghouse 0478100 use?
The official record identifies a GU5.3 base. The replacement socket must use the same base code; a similar-looking bulb shape does not establish socket compatibility.
Is Westinghouse 0478100 dimmable?
Yes. The official record marks this model as dimmable, but the installed dimmer must also support the lamp technology and load.
Can Westinghouse 0478100 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.