3157 Halogen Bulb 12V 21/5W Brake, Turn Signal & Reverse Light
3157 Halogen Bulb 12V 21/5W Brake, Turn Signal & Reverse Light
3157 Halogen Bulbs — Multifunctional Brake, Turn Signal & Reverse Light
Upgrade your vehicle's lighting with the 3157 DC 12V 21/5W Halogen Lamp, a reliable and versatile bulb designed to handle multiple functions in one compact package. Built with durable quartz glass construction, this bulb delivers bright, consistent illumination whether you're braking, signaling, or reversing.
Key Features
- Multifunctional Design: A single bulb serves as a brake light, turn signal, and reverse lamp — saving you time and money on replacements.
- Quartz Glass Construction: Heat-resistant quartz glass housing ensures long-lasting durability and reliable performance under everyday driving conditions.
- 12V / 21W & 5W Dual Filament: Standard automotive voltage compatibility makes installation straightforward with no modifications needed.
- 3157 Socket Fit: Direct plug-and-play replacement for vehicles using the 3157 socket type — no special tools or adapters required.
- 2 Emitting Color Options: Choose the color that suits your vehicle's style and lighting setup.
- Compact Size: Measures approximately 0.98 × 1.97 in (2.5 × 5.0 cm) for easy fitment in standard housings.
- Sold as a 2-Pack: Get two bulbs so you can replace both sides at once and always have a spare on hand.
Specifications
- Bulb Type: Halogen
- Socket Type: 3157
- Voltage: DC 12V
- Wattage: 21W / 5W (dual filament)
- Material: Quartz Glass
- Dimensions: 0.98 × 1.97 in / 2.5 × 5.0 cm
- Quantity: 2 Bulbs per Pack
Why Choose These Halogen Bulbs?
The 3157 halogen bulb is one of the most commonly used automotive bulbs on the road. Rather than stocking separate brake, signal, and reverse bulbs, this dual-filament design handles all three roles. The quartz glass envelope withstands higher temperatures than standard glass, helping extend the bulb's working life. With two color options available, you can match your vehicle's existing lighting aesthetic with ease.
For more information on automotive lighting safety standards, visit the National Highway Traffic Safety Administration (NHTSA) or review general vehicle safety guidelines at CPSC.gov.
Frequently Asked Questions
Q: What vehicles are compatible with the 3157 halogen bulb?
A: The 3157 bulb fits a wide range of makes and models that use the 3157 socket type, commonly found in brake lights, turn signals, and reverse lights on many North American vehicles. Always check your owner's manual or a bulb compatibility guide to confirm fitment for your specific year, make, and model before purchasing.
Q: What does "dual filament" mean for the 3157 21/5W bulb?
A: A dual-filament bulb contains two separate filaments within a single glass envelope — one operating at 21W for bright brake/signal lighting and one at 5W for lower-intensity functions such as parking or running lights. This allows one bulb to serve multiple lighting roles in a single socket.
Q: Why is quartz glass better than standard glass for automotive bulbs?
A: Quartz glass has a higher melting point and greater thermal resistance compared to standard borosilicate glass. This makes it better suited for the heat generated by halogen filaments, helping the bulb maintain consistent brightness and a longer operational life even under repeated use.
Q: How many bulbs are included in each order?
A: Each order includes 2 bulbs, making it convenient to replace both the driver-side and passenger-side lights at the same time — a recommended practice to ensure even, consistent lighting across your vehicle.