{"product_id":"hella-3157-halogen-bulb-12v-27-7w-clear-box-of-10","title":"Hella 3157 Halogen Bulb 12V 27\/7W Clear, Box of 10","description":"\u003cp class=\"nvn-hero\"\u003eThe Hella 3157 is the dual-filament replacement bulb your trailer and tail lights run on, and this is the 10-pack. A bright 27-watt filament handles brake and turn duty while a 7-watt filament glows for tail and running lights. Clear S8 glass, 12 volt, W2.5x16q wedge base. Simple, honest halogen that drops right in.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Hella 3157 is a standard dual-filament replacement bulb, and this is the ten-pack. One glass envelope, two filaments. A bright 27-watt side fires for your brake lights and turn signals, and a dimmer 7-watt side stays lit for tail and parking lights. It's a 12-volt bulb, so it drops straight into trailer and vehicle sockets wired for the 3157 pattern.\u003c\/p\u003e\n\u003cp\u003eWhy keep a box of ten on the shelf? Because these are the bulbs that quietly burn out on a boat trailer the week before a trip. Trailer tail and brake lamps take a beating out there. Road vibration, heat cycling, and the occasional dunk at the ramp all work against a filament. One corroded socket or a marginal ground, and a filament lets go. Having a fresh stack in the truck means you swap it right in the ramp parking lot instead of driving home in the dark with no brake lights.\u003c\/p\u003e\n\u003cp\u003eThe base is a W2.5x16q wedge. That's the four-contact glass wedge you'll find on most 3157 sockets. No metal collar, no bayonet pins, you just line it up and push it in until it seats. The glass envelope is the S8 size, clear, so it throws a clean white light that reads correctly through red and amber lenses. If your socket is wired for a 3157, and the very same base often carries a 3057 or 4157 number, this bulb fits.\u003c\/p\u003e\n\u003cp\u003eA quick word on the two filaments, because it trips people up. The 27-watt filament is the loud one. It's what makes your brake light jump when you hit the pedal and what flashes your turn signal. The 7-watt filament is the quiet one that glows for running and tail duty. Both live in the one bulb on the one wedge base. So if your brake function dies but the tail still glows, or the other way around, it's usually just one filament gone, and a fresh bulb puts both back.\u003c\/p\u003e\n\u003cp\u003eThis is a halogen bulb, not an LED, and that's on purpose. Two reasons it matters. First, it draws real current, so it keeps your flasher relay timing correct without a load resistor, the kind of thing an LED swap usually forces on you. Second, the output is that familiar warm incandescent light your lenses were designed around, so the color and spread stay true. If you want a no-surprises replacement that works with the factory wiring exactly as it sits, halogen is the easy answer.\u003c\/p\u003e\n\u003cp\u003eSwapping one is a two-minute job. Reach behind the lamp housing, twist the socket a quarter turn to free it, and pull the dead bulb straight out of the wedge. Push the new one in the same way, seat the socket back into the housing, and test both functions before you button it up. Tap the brakes, run the signals, check the running lights. If a fresh bulb still won't light, the trouble is upstream, usually a ground or the socket contacts, not the bulb itself.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Boat trailers, utility trailers, older trucks and SUVs, anything running a 3157 in the tail cluster. The ten-pack makes sense if you maintain more than one trailer, keep a small fleet moving, or just hate making a parts run on a Saturday. Stash a couple in the glove box, leave a few in the trailer toolbox, and keep the rest on the shelf for next time. Bulbs are cheap. A trip cut short by a failed light at the inspection lane is not.\u003c\/p\u003e\n\u003cp\u003eClear glass, 12 volt, 27\/7 watt, W2.5x16q wedge base, ten bulbs to a box. It's a simple part done right, from a name that's been building vehicle lighting for a very long time. And if you're not certain your rig takes a 3157, pull the old bulb first and read the number molded into the base before you order.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eDual filament rated 27W and 7W, so one bulb covers brake, turn, tail, and running-light duty\u003c\/li\u003e\n  \u003cli\u003e12-volt operation drops straight into standard 3157 sockets with no rewiring\u003c\/li\u003e\n  \u003cli\u003eW2.5x16q wedge base, push-in fit with no metal collar or bayonet pins\u003c\/li\u003e\n  \u003cli\u003eS8 clear glass envelope throws clean white light that reads true through red and amber lenses\u003c\/li\u003e\n  \u003cli\u003eHalogen design keeps factory flasher timing correct without adding a load resistor\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for sockets numbered 3157, 3057, or 4157\u003c\/li\u003e\n  \u003cli\u003eBox of 10, enough to stock a trailer, a truck, and the shelf\u003c\/li\u003e\n  \u003cli\u003eHella Marine build quality from a brand with decades in vehicle lighting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Hella Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does a 3157 bulb do?\u003c\/summary\u003e\n    \u003cp\u003eIt's a dual-filament bulb. The bright 27-watt filament fires for brake lights and turn signals, and the dimmer 7-watt filament glows for tail and running lights. Both filaments share one glass envelope and one wedge base.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat base does this bulb use?\u003c\/summary\u003e\n    \u003cp\u003eA W2.5x16q wedge base. That's the four-contact glass wedge used on most 3157 sockets. No metal collar, you just push it straight in until it seats.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a 12-volt bulb?\u003c\/summary\u003e\n    \u003cp\u003eYes. It's rated 12 volt, 27\/7 watt, which is the standard rating for 3157 tail-light circuits on trailers and vehicles.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an LED or a halogen bulb?\u003c\/summary\u003e\n    \u003cp\u003eHalogen. Because it draws normal current, it keeps your flasher relay timing correct without a load resistor, and the warm white output matches what your lenses were designed around.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow many bulbs come in the box?\u003c\/summary\u003e\n    \u003cp\u003eTen. It's a bulk ten-pack, which is handy if you maintain more than one trailer or just want spares on the shelf.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use this on a boat trailer?\u003c\/summary\u003e\n    \u003cp\u003eYes, as long as the trailer's tail, brake, or turn sockets are wired for a 3157. Pull an existing bulb and check the number molded into the base to confirm before you order.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the difference between a 3057 and a 3157 bulb?\u003c\/summary\u003e\n    \u003cp\u003eThey share the same W2.5x16q wedge base and the same 12V 27\/7W dual-filament rating, so they're interchangeable in the same sockets. The 3157 is the common service number you'll see most often.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the difference between a 3157 and a 3156 bulb?\u003c\/summary\u003e\n    \u003cp\u003eA 3156 is a single-filament bulb for one function, while the 3157 is dual filament and handles both a bright and a dim circuit. The bases are not the same, so match the number your socket calls for.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat can I use in place of a 3157 bulb?\u003c\/summary\u003e\n    \u003cp\u003eSockets wired for a 3157 also accept a 3057 or 4157, since they share the same base and 12V 27\/7W rating. Check the number on your old bulb to be sure.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat color is the light?\u003c\/summary\u003e\n    \u003cp\u003eThe glass is clear, so the bulb puts out white light. The lens over it, red for tail and brake or amber for turn, sets the final color you see.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eHella 3157 Dual-Filament Halogen Bulb, Clear, Box of 10\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHella Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e3157\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e760687144557\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBulb Technology\u003c\/th\u003e\n\u003ctd\u003eHalogen\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e12V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWattage\u003c\/th\u003e\n\u003ctd\u003e27\/7W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFilament\u003c\/th\u003e\n\u003ctd\u003eDual filament\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBase\u003c\/th\u003e\n\u003ctd\u003eW2.5x16q\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eGlass Envelope\u003c\/th\u003e\n\u003ctd\u003eS8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBulb Color\u003c\/th\u003e\n\u003ctd\u003eClear\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eBrake, tail, turn signal and reverse lights\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackage Quantity\u003c\/th\u003e\n\u003ctd\u003eBox of 10\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does a 3157 bulb do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a dual-filament bulb. The bright 27-watt filament fires for brake lights and turn signals, and the dimmer 7-watt filament glows for tail and running lights. Both filaments share one glass envelope and one wedge base.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What base does this bulb use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A W2.5x16q wedge base. That's the four-contact glass wedge used on most 3157 sockets. No metal collar, you just push it straight in until it seats.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a 12-volt bulb?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It's rated 12 volt, 27\/7 watt, which is the standard rating for 3157 tail-light circuits on trailers and vehicles.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this an LED or a halogen bulb?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Halogen. Because it draws normal current, it keeps your flasher relay timing correct without a load resistor, and the warm white output matches what your lenses were designed around.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How many bulbs come in the box?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Ten. It's a bulk ten-pack, which is handy if you maintain more than one trailer or just want spares on the shelf.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use this on a boat trailer?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, as long as the trailer's tail, brake, or turn sockets are wired for a 3157. Pull an existing bulb and check the number molded into the base to confirm before you order.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between a 3057 and a 3157 bulb?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"They share the same W2.5x16q wedge base and the same 12V 27\/7W dual-filament rating, so they're interchangeable in the same sockets. The 3157 is the common service number you'll see most often.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the difference between a 3157 and a 3156 bulb?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A 3156 is a single-filament bulb for one function, while the 3157 is dual filament and handles both a bright and a dim circuit. The bases are not the same, so match the number your socket calls for.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What can I use in place of a 3157 bulb?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Sockets wired for a 3157 also accept a 3057 or 4157, since they share the same base and 12V 27\/7W rating. Check the number on your old bulb to be sure.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What color is the light?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The glass is clear, so the bulb puts out white light. The lens over it, red for tail and brake or amber for turn, sets the final color you see.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Hella Marine","offers":[{"title":"Default Title","offer_id":67601936810077,"sku":"2011353","price":4.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_27f36da5-c1e8-4ff8-aa20-70dc1a4b000c.jpg?v=1791026915","url":"https:\/\/nvnmarine.com\/products\/hella-3157-halogen-bulb-12v-27-7w-clear-box-of-10","provider":"NVN Marine","version":"1.0","type":"link"}