Product Overview: 1157 BAY15D Switchback Dual-Color LED Bulb with Protective Glass Cover (Wireless 1:1 OEM Direct Replacement)
The MIDCARS 1157-54L14 is a specialized switchback dual-color LED bulb with a clear protective glass cover engineered for seamless 1:1 direct replacement of conventional dual-filament incandescent bulbs including 1157, BAY15D, P21/5W, 2057, 2357, and 7528. Designed specifically for automotive front park/turn signal fixtures and motorcycle dual-function lighting, 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.
Equipped with a sealed high-transparency cylindrical glass cover over a CNC-machined Solid 6063 Aluminum heat-sink body (Dimensions: D25mm * L50mm), it provides robust physical shielding against dust, engine bay contaminants, and road moisture, while delivering an ultra-smooth 360-degree optical diffusion. Powered by 54 pieces of high-density SMD 3014 LEDs (Ra ≥ 80), it outputs 200 Lumens (2.0W) in 6500K Pure White and 300 Lumens (3.0W) in Signal Amber. Designed for wide voltage DC 12V - 24V operation (with transient surge suppression up to 36V), it provides superior thermal reliability backed by our 2-year factory warranty.
Precision Dimensional Blueprint & BAY15D Socket Specifications
Precision engineered with exact OEM base tolerances (Diameter: 25.0 mm, Overall Length: 50.0 mm). The BAY15D dual-contact bayonet base features 180-degree radial pins with unequal pin heights, preventing reverse or incorrect socket insertion.
Real Illumination & Dual-Color Light Pattern
High-transparency optical glass enclosure delivers 360-degree cylindrical light diffusion without shadows or dark spots, perfectly matching reflector optics:
Intelligent Switchback Operating Logic & Dual-Contact Architecture
The internal driver utilizes the factory dual-contact circuit (Low-Contact for DRL / High-Contact for Turn Signal) with automatic signal-priority sensing:
- Daytime Running Mode (DRL): When parking lights or ACC are active, low-wattage 6500K Pure White (2.0W, 200 LM) remains steadily illuminated.
- Turn Signal Mode (Priority Override): When the driver activates the turn signal, the internal controller instantly cuts off White light and flashes high-intensity Amber (3.0W, 300 LM) synchronously with the vehicle flasher relay.
- Automatic Reset: Once the turn signal is canceled, White DRL automatically restores after an integrated 1.0-second delay, preventing rapid color switching between flashes.
- 100% Wireless Direct Plug: No external ACC wiring harness, no engine firewall pass-through, and no wire splicing required.
The 1157-54L14 is engineered with a standard electrical load (White 2.0W / Amber 3.0W) without internal power-wasting dummy load resistors to maintain cool operating temperatures and maximum LED lifespan. For vehicles equipped with mechanical or thermal flasher relays that experience hyper-flashing or dashboard bulb-out warnings, adding an external gold aluminum load resistor across the turn signal circuit is recommended:
• 12V Electrical Systems: Connect a 25W 10 Ohm gold aluminum load resistor in parallel with the Amber turn signal circuit.
• 24V Heavy-Duty / Commercial Vehicles: Connect a 25W 27 Ohm gold aluminum load resistor in parallel with the Amber turn signal circuit.
Note: Only connect load resistors across the intermittent turn signal circuit; never connect load resistors to continuous DRL circuits.
Primary Commercial & Automotive Applications
B2B Wholesale, OEM Manufacturing & Customization Capabilities
As an ISO9001-certified direct automotive lighting manufacturing facility in Dongguan, China, MIDCARS provides end-to-end B2B supply chain solutions for automotive distributors, regional wholesalers, brand importers, and e-commerce private-label sellers:
- Flexible MOQ: Standard stock configurations supported from 5 pairs; full custom packaging MOQ starts at 2500 pairs.
- Rapid Sample Turnaround: Standard off-the-shelf samples dispatch within 2–3 business days; custom sample builds within 5–7 business days.
- Custom Color Combinations: Standard White + Amber, Warm White (3000K) + Amber, Red + Amber, and Amber + Amber available.
- Branding & Packaging: Laser-etched customer logo on aluminum collar, anti-static polybag, premium sliding retail gift box, or blister clamshell packaging.
- Factory Compliance & Warranty: Full batch EMC testing compliance (CE), RoHS certified components, supported by an unconditional 2-year factory replacement warranty.