Independent reference · not a sales listing
Feit Electric F40CWX/U6
2 ft. 40W Cool White (4100K) G13 Base (T12 Replacement) U-Bend Fluorescent Linear Light Tube
This is a 40-watt fluorescent with a T12 envelope and G13 base. It produces 2,700 lumens. The listed light color is 4100 K daylight. 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 G13 exactly. The T12 code describes the bulb envelope, not the socket. Compare base profiles.
- 02
Electrical rating
Voltage is not stated in this snapshot. Read it from the lamp or official record before substituting.
- 03
Brightness, not “watts”
Target about 2,700 lumens. The 40 W figure is input power, not brightness.
- 04
Physical clearance
Confirm that the T12 envelope fits the shade or cover; this snapshot does not provide complete dimensions.
- 05
Heat, controls, and location
Enclosed-fixture use is not stated; it is marked non-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
- Feit Electric
- SKU / model
- F40CWX/U6
- Technology
- FLUORESCENT
- Shape
- T12
- Base
- G13
- Voltage
- Not stated
- Input power
- 40 W
- Incandescent equivalent
- Not stated
- Light output
- 2,700 lumens
- Color temperature
- 4100 K
- CRI
- 87
- Dimmable
- No
- Rated life
- 18,000 hours
- Beam angle
- Not stated
- Location rating
- Not stated
- Enclosed fixture
- Not stated
- Pack quantity
- 1
Useful next check
Nearby specification matches
Same G13 base and within 35% of 2,700 lumens. These are comparison leads, not confirmed substitutes.
F40BWX/U6
T12 · G13 · 40 W
2,700 lm 3500 KFeit ElectricF30T12/CW/RS/2
T12 · G13 · 30 W
1,900 lm 4100 KFeit ElectricT1248/840/LED/25
T12 · G13 · 20 W
1,800 lm 4000 KFeit ElectricF32T8/841/U6
T8 · G13 · 32 W
2,800 lm 4100 KFeit ElectricF30T8/CW
T8 · G13 · 30 W
2,350 lm 4100 KFeit ElectricF32T8/930/2
T8 · G13 · 32 W
2,750 lm 3000 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.
G13 · 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 Feit Electric model records
Compare verified models from the same official catalog snapshot by SKU, base, shape, power, and output.
Browse brand →Quick answers
Questions about F40CWX/U6
What socket does Feit Electric F40CWX/U6 use?
The official record identifies a G13 base. The replacement socket must use the same base code; a similar-looking bulb shape does not establish socket compatibility.
Is Feit Electric F40CWX/U6 dimmable?
No. The official record marks this model as non-dimmable, so it should not be used on a dimming circuit.
Can Feit Electric F40CWX/U6 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.