{"product_id":"alla-lighting-3157-3457-t25-switchback-led-bulbs-6000k-white-amber-2-pack-28x2835-smd","title":"Alla Lighting 3157\/3457 T25 Switchback LED Bulbs - 6000K White\/Amber, 2-Pack, 28x2835 SMD","description":"\u003cp\u003e\u003cstrong\u003eAlla Lighting T25 3157 switchback LED bulbs are dual-color wedge lamps that deliver bright 6000K white for daytime\/parking lights and vivid amber for turn signals in a single 12V-compatible unit.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese T25\/3157-style switchback LEDs are an aftermarket upgrade designed to replace dual-function parking\/DRL and turn-signal bulbs. Each bulb packs 28 high-output 2835 SMD LEDs to produce clear xenon-white illumination for running lights and an intense amber flash when signaling. The kit includes two bulbs and is built to work with vehicles that use the 3157\/3457\/4057\/4157 and similar wedge sockets, offering a plug-and-play visual improvement when matched with appropriate resistors or vehicle electronics.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these bulbs switch between white DRL and amber turn signal?\u003c\/h3\u003e\n\u003cp\u003eSwitchback bulbs use two internal LED circuits: one set emits a steady 6000K white for parking or DRL, and a second set switches to amber when the turn signal circuit activates. The change is automatic and synchronized to the vehicle's signal wiring without rewiring when the original lamp uses a dual-filament socket.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDual-circuit 28 x 2835 SMD layout for both colors\u003c\/li\u003e\n  \u003cli\u003e6000K xenon-white output for parking\/DRL\u003c\/li\u003e\n  \u003cli\u003eBright amber LEDs for turn signals\u003c\/li\u003e\n  \u003cli\u003eRequires a 50W 6Ω load resistor in some vehicles to prevent hyper-flash\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these fit my car's 3157, 3457 or 4057 sockets?\u003c\/h3\u003e\n\u003cp\u003eThe bulbs are built to the T25 wedge form factor and list broad compatibility with many dual-filament wedge part numbers such as 3157, 3457, 4057, 4157 and numerous manufacturer variants. Check your owner's manual or remove the old bulb to verify it is a dual-function wedge type before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon fitment: 3157, 3457, 4057, 4157 and equivalent codes\u003c\/li\u003e\n  \u003cli\u003ePhysical size: approx. 0.71\" diameter x 2.50\" length\u003c\/li\u003e\n  \u003cli\u003eDesigned for sockets using one bulb for both DRL\/parking and turn signal\u003c\/li\u003e\n  \u003cli\u003eMay need load resistors or CAN-bus adapters in modern vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDo I need additional parts or special wiring to install them?\u003c\/h3\u003e\n\u003cp\u003eInstallation is typically plug-and-play in vehicles that already use dual-filament wedge bulbs, but some cars detect lower current from LEDs and will hyper-flash or show bulb errors. In that case add a 50W 6Ω load resistor or a compatible CAN-bus adapter to restore proper flash rate and avoid dashboard warnings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks on 12V–18V DC electrical systems\u003c\/li\u003e\n  \u003cli\u003eAdd a 50W 6Ω load resistor if hyper-flash or error occurs\u003c\/li\u003e\n  \u003cli\u003eStandard socket wiring remains unchanged for most installs\u003c\/li\u003e\n  \u003cli\u003eOne-year limited warranty from Alla Lighting for defects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow bright and durable are these LED switchback bulbs?\u003c\/h3\u003e\n\u003cp\u003eEach bulb contains twenty-eight 2835 SMD LEDs arranged for both intensity and even beam pattern. They are engineered to deliver a very bright white for visibility during the day and a high-contrast amber for signaling, while operating within typical automotive voltage ranges.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e28 high-power 2835 SMD LEDs per bulb for strong output\u003c\/li\u003e\n  \u003cli\u003eRated for 12V–18V operation suitable for most cars and trucks\u003c\/li\u003e\n  \u003cli\u003eConstructed for consistent color and brightness over time\u003c\/li\u003e\n  \u003cli\u003eSold as a set of two bulbs with 1-year warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: These switchback LED bulbs are intended for vehicle owners wanting a single-bulb solution to modernize front parking\/DRL lights and turn signals without changing fixtures. They suit DIY installers, car enthusiasts upgrading to LED illumination, and owners of vehicles that accept 3157\/3457\/4057-style wedge lamps — provided any required load resistors or CAN-bus modules are added for compatibility with modern electrical systems.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will these bulbs fit my 3157 socket?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — they are T25-style designed for 3157, 3457, 4057, 4157 and similar dual-filament wedge sockets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need resistors to stop hyper-flash?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Many modern vehicles require a 50W 6Ω load resistor or CAN-bus adapter to prevent hyper-flash or error messages.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Alla Lighting","offers":[{"title":"Default Title","offer_id":48086277718174,"sku":"B019EYJU8A","price":45.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/alla-lighting-front-view-packaging.jpg?v=1785893293","url":"https:\/\/northtrailauto.ca\/products\/alla-lighting-3157-3457-t25-switchback-led-bulbs-6000k-white-amber-2-pack-28x2835-smd","provider":"North Trail Auto","version":"1.0","type":"link"}