921 Light Bulb Replacement Guide
After extensively researching a number of different independent tests, we have chosen the 921 lamps based on the brightness, durability and lifespan.
| LASFIT 921 912 LED Bulb | AUXITO LED High Power 2835 15-SMD Chipsets | Philips Automotive Lighting 921WLED Ultinon LED (White) | JDM ASTAR Extremely Bright 2000 Lumens | |||||
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Product specifications (main) |
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| Size | 921 | 921 | 921 | 921 | ||||
| Type | LED | LED | LED | LED | ||||
| Wattage | 6WW | |||||||
| Voltage | 12V | 12V | 12V | |||||
| Color Temperature | 6000K | 6000K | 6000K | 6000K | ||||
| Manufacturer Part Number | B081YL2Q2W | B0728DYR9H | B077FMLN7B | B01GGK6QDW | ||||
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Product specifications (additional) |
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| Light output | 1400 Lm | 115 Lm | 1000 Lm | |||||
| Lifespan | 30000 Hours | 70000 Hours | 20000 Hours | |||||
| Weight | 0.63 Oz | 0.6 Oz | 0.32 Oz | 0.6 Oz | ||||
| Bulb Length | 4.29 In | 1.57 In | 1.86 In | |||||
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Features |
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| CANBUS-free | |
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| Requires Ballast | |
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| Universal Fitment | |
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| Plug and Play | |
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Price |
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What Drivers Should Know About 921 Bulbs?
W16W also known as the 921 lamp is a halogen light bulb typically used as a reverse light or backup light on many vehicles. The W16W designation comes from the bulb's width of 16 mm and its length of 29 mm.
These bulbs have a nominal power of 12 V: 16 W which means that the power drawn by the bulb is 16 watts. The nominal voltage is usually slightly higher than the rated voltage to allow for voltage losses in the circuit. With such parameters, the 921 light bulb is one of the most powerful in the category of backup or reverse lights. With only 1 filament this automotive light bulb has a long service life.
It has a color temperature of 6500K and a light output of 2000 lumens, it makes for a very bright white light. Thanks to the special gas filling, the 921 bulb has a much higher efficiency than incandescent bulbs.
The three main benefits of using a 921 light bulb are:
- Increased safety when driving
- Better visibility
- Longer service life
If you are looking for a powerful and bright light for your backup or reverse lights, then the 921 bulb is a good option. Thanks to its high efficiency and long service life, it is a popular choice among drivers.
What base is a 921 bulb?
The wedge base W2.1×9.5d is a type of base used on several types of light bulbs. The wedge base is named for its shape; it is essentially a triangular prism with two sloped sides and one flat side. The dimensions of the base are given in millimeters. The W2.1×9.5d designation means that the width of the base is 2.1 mm and the length is 9.5 mm.
The wedge base is one of the most common types of bases used on light bulbs, as it can be found on a variety of different bulb types, including incandescent, halogen, and LED bulbs.
What Is A 921 Bulb Used For?
This bulb is an excellent direct replacement for your car or truck's interior or exterior lighting. These bulbs have been built to endure a large amount of road shock and vibration, and have improved longevity.
The 921 automotive light bulb would be perfect for your car's backup lights, turn signals, or parking lights. You can also use these bulbs in your truck's taillights, brake lights, or reverse lights. These bulbs are much brighter than standard incandescent bulbs and will give your vehicle a modern look.
What Bulb Is The Same As 921?
The 912 and 921 bulbs are interchangeable because they use the same T-5 wedge base. The 921 consumes 16.8 watts and draws 1.4 amps of electricity. The 912 has a wattage of 12 and draws 1 amp of current. As a result, the 921 should burn brighter than a regular 912 light bulb.
If you want to interchange the 921 bulb with another one, you can use the 912, 516, or 168. All these bulbs have the same T-5 wedge base and will fit in your car's light socket. The replacement process is simple and can be done in a matter of minutes. All you have to do is simply take a look at your car's manual to know which bulb size to buy.
FAQ – 921 Bulb Specs, Fits what cars, Cross Reference
What is a 921 bulb?
A 921 bulb is a 12-volt automotive light bulb with a wedge base, commonly used for reverse lights, backup lamps, interior lights, and some auxiliary rear lighting.
What does W16W mean on a 921 bulb?
W16W is the ECE (European) designation for the 921 bulb, meaning a wedge-base bulb rated at 16 watts.
Are 921 and W16W bulbs the same?
Yes. 921 is the North American designation, while W16W is the international/ECE equivalent. They are functionally identical.
What is the wattage of a standard 921 bulb?
A standard incandescent 921 bulb is typically rated at 16–18 watts.
How many lumens does a 921 incandescent bulb produce?
Most incandescent 921 bulbs produce approximately 250–300 lumens.
How many lumens does a 921 LED bulb have?
LED 921 bulbs usually range from 400 to 1600+ lumens, depending on design and brand.
What amperage does a 921 bulb draw?
A traditional 921 incandescent bulb draws about 1.3–1.5 amps at 12 volts. LED versions usually draw under 0.3 amps.
What are the dimensions of a 921 bulb?
Typical size is about 37–38 mm in length and 10–11 mm in width, though LED versions may be longer.
What base does a 921 bulb use?
The 921 bulb uses a T15 / W16W wedge base.
Are 921 and 922 bulbs the same?
No. They are similar in size, but the 922 bulb has lower wattage and produces less light.
What is the difference between a 921 and 922 bulb?
The 921 is brighter and more powerful, while the 922 is designed for lower heat and reduced output.
Can a 921 bulb replace a 912 bulb?
Physically yes, but electrically the 921 is brighter and runs hotter, so it may not be recommended in all housings.
What is the difference between 912 and 921 bulbs?
912 bulbs are lower wattage and dimmer, while 921 bulbs provide higher light output.
What’s the difference between a 921 and a 168 bulb?
A 168 (W5W) bulb is much smaller and less powerful. The 921 is used where higher brightness is required.
Is a 921 bulb the same as a 194 bulb?
No. A 194 bulb is a low-wattage bulb commonly used for markers or dashboards, while a 921 is significantly brighter.
What is a 921LL bulb?
921LL stands for Long Life. It has an extended lifespan but slightly reduced brightness compared to standard 921 bulbs.
What does the “K” mean in a 921K bulb?
The “K” usually indicates a manufacturer-specific series or internal designation, not a different bulb standard.
Can I replace a 921 bulb with LED?
Yes. LED 921 bulbs are widely available and offer higher brightness, lower power consumption, and longer lifespan.
Do 921 LED bulbs cause CAN-bus errors?
Some vehicles may require CAN-bus compatible LEDs or resistors to prevent bulb-out warnings.
What is the LED equivalent of a 921 bulb?
A T15 / W16W LED bulb designed for 12-volt automotive systems.
Are 921 bulbs commonly used for reverse lights?
Yes. Reverse and backup lights are one of the most common applications for 921 bulbs.
Can a 921 bulb be used for brake lights?
Occasionally for auxiliary or third brake lights, but not typically for primary brake lamps.
Are halogen 921 bulbs still used?
Yes, but many drivers upgrade to LED for improved brightness and efficiency.
What vehicles commonly use 921 bulbs?
Many Ford, Chevrolet, Toyota, Honda, Nissan, and GMC vehicles use 921 bulbs for rear and interior lighting.
What is the brightest 921 LED bulb available?
High-output models can exceed 1200–1600 lumens, depending on LED chip type and cooling design.
What bulbs are interchangeable with a 921 bulb?
Some interchangeable options include 912, 906, and 922, but wattage and heat differences must be considered.