{"product_id":"3157-halogen-bulb-12v-21-5w-brake-turn-signal-reverse-light","title":"3157 Halogen Bulb 12V 21\/5W Brake, Turn Signal \u0026 Reverse Light","description":"\u003ch2\u003e3157 Halogen Bulbs — Multifunctional Brake, Turn Signal \u0026amp; Reverse Light\u003c\/h2\u003e\n\u003cp\u003eUpgrade your vehicle's lighting with the \u003cstrong\u003e3157 DC 12V 21\/5W Halogen Lamp\u003c\/strong\u003e, a reliable and versatile bulb designed to handle multiple functions in one compact package. Built with durable \u003cstrong\u003equartz glass\u003c\/strong\u003e construction, this bulb delivers bright, consistent illumination whether you're braking, signaling, or reversing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultifunctional Design:\u003c\/strong\u003e A single bulb serves as a brake light, turn signal, and reverse lamp — saving you time and money on replacements.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuartz Glass Construction:\u003c\/strong\u003e Heat-resistant quartz glass housing ensures long-lasting durability and reliable performance under everyday driving conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12V \/ 21W \u0026amp; 5W Dual Filament:\u003c\/strong\u003e Standard automotive voltage compatibility makes installation straightforward with no modifications needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3157 Socket Fit:\u003c\/strong\u003e Direct plug-and-play replacement for vehicles using the 3157 socket type — no special tools or adapters required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 Emitting Color Options:\u003c\/strong\u003e Choose the color that suits your vehicle's style and lighting setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Size:\u003c\/strong\u003e Measures approximately 0.98 × 1.97 in (2.5 × 5.0 cm) for easy fitment in standard housings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSold as a 2-Pack:\u003c\/strong\u003e Get two bulbs so you can replace both sides at once and always have a spare on hand.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBulb Type:\u003c\/strong\u003e Halogen\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSocket Type:\u003c\/strong\u003e 3157\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e DC 12V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWattage:\u003c\/strong\u003e 21W \/ 5W (dual filament)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Quartz Glass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.98 × 1.97 in \/ 2.5 × 5.0 cm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 2 Bulbs per Pack\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose These Halogen Bulbs?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on automotive lighting safety standards, visit the National Highway Traffic Safety Administration (NHTSA) or review general vehicle safety guidelines at CPSC.gov.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What vehicles are compatible with the 3157 halogen bulb?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does \"dual filament\" mean for the 3157 21\/5W bulb?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Why is quartz glass better than standard glass for automotive bulbs?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many bulbs are included in each order?\u003c\/h4\u003e\n\u003cp\u003eA: Each order includes \u003cstrong\u003e2 bulbs\u003c\/strong\u003e, 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What vehicles are compatible with the 3157 halogen bulb?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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