Technical Description & Specifications
Product Overview: 1157 BAY15D Dual-Color Switchback LED Bulb (Wireless 1:1 OEM Direct Replacement)
The MIDCARS 1157-54L35 is an engineered dual-color switchback LED bulb designed for seamless 1:1 direct replacement of conventional dual-filament incandescent bulbs including 1157, BAY15D, P21/5W, 2057, 2357, and 7528. Tailored specifically for front park/turn signal fixtures and motorcycle lighting systems, this model features a completely wireless architecture (No external ACC lead required), utilizing the vehicle's original dual-contact socket for direct power separation between low-wattage White DRL and high-intensity Amber turn signals.
Constructed with a heavy-duty Solid 6063 Aluminum heat-sink body in an open-frame direct thermal dissipation design (No glass or plastic outer cover), it eliminates trapped heat, ensuring superior natural convection and rock-solid junction temperature control across wide DC 12V - 24V operating systems (with transient surge protection up to 36V). Driven at conservative, high-efficiency currents across 54 SMD 2835 emitters, it guarantees over 30,000 hours of continuous operating lifespan supported by our 2-year factory warranty.
Precision Dimensional Blueprint & BAY15D Socket Specifications
Detailed dimensional blueprint showing precise 1:1 bulb profile (D18mm x L49mm), 180° radial index pins with unequal height (High/Low alignment pins for physical mistake-proofing), and dual bottom contacts matching international P21/5W standards without headlight housing modification:
Real Illumination & Dual-Color Light Pattern
High-definition live workshop demonstration showing crisp 6500K xenon white daytime running light and vibrant 595-600nm amber turn signal illumination under full 360-degree radial diffusion:
Intelligent Switchback Operating Logic & Dual-Contact Architecture
How True Wireless Switchback Function Operates:
- OEM Socket Direct Integration: The BAY15D base features two distinct bottom solder contacts matching the vehicle's dual-filament harness (Pin 1: 5W circuit for White DRL / Parking; Pin 2: 21W circuit for Amber Turn Signal; Base Shell: Common Ground).
- Default Mode (Parking / DRL): When parking lights or DRL are activated, the low-power 5W circuit energizes the internal controller to illuminate 6500K Xenon White continuously.
- Turn Signal Active (Switchback Override): When the driver signals a turn or hazard, the high-power 21W circuit receives flasher power. The intelligent onboard micro-controller instantly overrides and shuts off White DRL, flashing 595–600nm Automotive Amber exclusively for maximum traffic visibility.
- Turn Signal Cancelled: Once the turn signal is turned off, the internal controller waits 1.0 second to confirm signaling has ended, then automatically restores the 6500K Xenon White DRL smoothly without flicker.
1. Hyper-Flash Notice (Flasher Relay Operation): Because LED bulbs draw significantly less current than original 21W incandescent filaments (4W vs 21W), vehicles equipped with thermal or mechanical flasher relays may detect the low load and hyper-flash (fast blink). To restore factory-standard flash rates:
- For 12V Systems: Add an external 25W 10 Ohm gold aluminum load resistor (or replace with an electronic LED flasher relay).
- For 24V Systems (Trucks/Heavy Duty): Add an external 25W 27 Ohm load resistor (do NOT use 10 Ohm on 24V systems, as it will dissipate over 57W and overheat).
- Installation Note: The load resistor must be wired exclusively across the Turn Signal (21W) circuit and ground. Never connect a load resistor to the continuously-lit DRL (5W) circuit!
2. Bulb-Out Warning / CANBus Systems: Modern European vehicles with active bulb-monitoring computers may display a dashboard warning. Dedicated CANBus-equipped versions or external plug-and-play decoders are available upon request for B2B fleet orders.
Cross-Reference & Socket Interchangeability Database
The MIDCARS 1157-54L35 directly interchanges with and upgrades standard dual-filament automotive miniature incandescent bulbs worldwide:
Fitment Verification Note: Features 180° opposing index pins with unequal height (High/Low alignment pins). Not compatible with single-contact 1156 BA15S/BAU15S or 150° offset pin sockets.
Primary Commercial & Automotive Applications
1. Front Turn Signal & DRL Conversion
Upgrades clear or amber front turn signal housings on passenger cars, pickup trucks, and SUVs into dual-function Xenon White Daytime Running Lights and high-contrast Amber turn signals without modifying OEM wiring.
2. Motorcycle Dual-Filament Retrofit
Widely adopted in cruiser, touring, and street motorcycles with front dual-filament 1157 bullet or flat-lens turn signals, providing continuous white running safety illumination combined with unmistakable amber directional flashing.
3. Tail / Brake & Rear Turn Customization
In custom vehicle and trailer applications, the Red + Amber dual-color option enables red running/brake illumination switching to amber rear turn signals in a single standard 1157 light cluster.
4. 24V Commercial Vehicle & Fleet Lighting
Rugged wide-voltage driver accommodates 24V bus, coach, commercial truck, and trailer electrical systems, delivering durable solid-state vibration resistance and extended maintenance cycles.
B2B Wholesale, OEM Manufacturing & Customization Capabilities
As an integrated automotive LED design and manufacturing facility established in 2016 in Dongguan, China, MIDCARS offers comprehensive OEM and ODM support for global distributors, wholesalers, and private brands:
- Precision Laser Engraving: Custom logo, part number, batch coding, and voltage specifications permanently laser-marked on the 6063 aluminum lamp collar.
- Custom Packaging Solutions: Retail color boxes, customized blister card hanging packs, dual-pack anti-static pouches, and bulk master packaging with customer brand artwork.
- Electrical & Voltage Engineering: Dedicated 6V-12V configurations for classic vintage automobiles and retro motorcycles, or optimized 24V commercial truck driver designs.
- Rapid Sampling & Production Lead Times: Standard warehouse samples dispatched within 2–3 business days; custom branded prototypes completed in 5–7 business days.
- Warranty & Compliance: Backed by our standard 2-year factory replacement warranty, fully compliant with CE (EMC Directive) and RoHS environmental standards.
Contact our factory sales team directly at sales02@zhishanled.com for wholesale tier pricing, distributor agreements, and technical engineering specifications.