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1156 BA15S BAU15S Automotive LED Bulb (P21W PY21W Equiv) - Glass Cover (6-15V / 12-36V / 48-80V)
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1156 BA15S automotive LED signal bulb 3W 300LM with protective cylindrical glass cover studio shot
1156-39L automotive LED bulb clear glass dome and 39x SMD 3014 cylindrical array close-up
1156 automotive LED bulb nickel plated metal bayonet base and single bottom contact
Top optical view of 1156 LED bulb showing cylindrical emitter array and glass cover
1156 automotive LED bulb standing perspective studio display with aluminum heat sink collar
Pair of 1156 automotive LED signal bulbs showing standing and horizontal base comparison
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Cross Reference / Direct Replacement
P21W (1156 / BA15S 180° Parallel Pins)
PY21W (1056 / BAU15S 150° Offset Amber Turn Signal Pins)
BAY15S (Single-Filament Indexed Bayonet Base)
1157 / BAY15D (Optional Dual-Contact Dual-Mode Base)
1141 / 1003 / 1073 / 7506 (Direct Automotive Bayonet Cross-Reference)
6-15VDC (Passenger Cars, Classic Vintage & Motorcycles)
12-36VDC (Heavy-Duty Commercial Trucks, Trailers & Coaches)
48-80VDC (Electric Warehouse Forklifts & Industrial Utility Fleets)

1156 BA15S BAU15S Automotive LED Bulb (P21W PY21W Equiv) - Glass Cover (6-15V / 12-36V / 48-80V)

3.0W automotive and industrial vehicle LED signaling bulb delivering 300LM (replacing OEM P21W and PY21W incandescent lamps) with 39x SMD 3014 LEDs, protective glass cover, aluminum heat sink, available in BA15S, BAU15S, BAY15S, and BAY15D bases across 6-15VDC, 12-36VDC, and 48-80VDC power tiers.
Product Model:1156-39L
Socket / Base:BA15S (1156 / P21W) · BAU15S (1056 / PY21W 150°) · BAY15S · (Optional 1157 BAY15D)
Operating Voltage:6-15VDC / 12-36VDC / 48-80VDC (Factory-Discrete Driver Boards)
Power Consumption:3.0W (Non-CANBus Solid-State High-Efficiency Circuit)
Luminous Flux:300 Lumens (Daylight White · 360° Cylindrical Optical Emission)
Color Options:White 6500K · Warm White 3000K · Amber Yellow (595-600nm) · Red (620-630nm)
LED Emitters:39x High-Efficiency SMD 3014 LEDs (Uniform 360° High-Density Array)
Enclosure / Body:Protective Cylindrical Glass Cover + Solid 6063 Aluminum Heat-Sink Collar
Bulb Dimensions:Φ25mm Globe Diameter × 51mm Total Length (Standard S25 Envelope)
CANBus & Decoding:Non-CANBus; External 25W Load Resistor Recommended (12V: 10Ω / 24V: 27Ω)
Primary Uses:Turn Signal Lights, Brake Lights, Daytime Running Lights (DRL), Reverse Lights
Quality & Warranty:CE (EMC Compliant), RoHS | 2 Years Factory Warranty
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  • Product Details

1156 BA15S BAU15S Automotive LED Replacement Bulb (P21W & PY21W Sockets)

The 1156-39L is an industrial-grade automotive and industrial vehicle LED signaling bulb engineered as an energy-efficient direct replacement for OEM P21W (1156 BA15S) and PY21W (1056 BAU15S 150-degree offset pin) incandescent bulbs. Featuring 39 high-density SMD 3014 LEDs mounted around an internal aluminum pillar and protected by a robust cylindrical optical glass cover with solid 6063 aluminum collar, it produces 300 lumens of continuous 360-degree illumination with instantaneous on/off response for enhanced road safety.

Multi-Base Compatibility & Real Vehicle Application Gallery

Available across four standardized bayonet base options to match various vehicle wiring harnesses: BA15S (1156 P21W) with 180° parallel pins, BAU15S (1056 PY21W) with 150° offset pins, BAY15S, and dual-contact BAY15D (1157 P21/5W). Click drawings and application gallery to inspect pinouts and lighting effects:

1157 BAY15D dual contact offset pin LED bulb dimensional drawing D25x51mm
BAY15D (1157 / P21/5W)
Dual Contact · Offset Staggered Pins
1056 BAU15S PY21W amber turn signal LED bulb 150 degree pin drawing D25x51mm
BAU15S (1056 / PY21W)
Single Contact · 150° Offset Pins
1156 BA15S P21W reverse and brake LED bulb 180 degree parallel pin drawing D25x51mm
BA15S (1156 / P21W)
Single Contact · 180° Parallel Pins
Automotive daytime running light and amber turn signal real vehicle night illumination comparison
Vehicle Lighting Installation
White DRL & Amber Turn Signal Duty

Key Optical & Mechanical Engineering Features

  • 360-Degree Cylindrical Beam Pattern: 39 evenly spaced SMD 3014 LEDs eliminate dark shadows and hot spots, reflecting perfectly into OEM vehicle parabolic reflectors.
  • Glass Enclosure & 6063 Aluminum Heat Collar: Sealed optical glass enclosure prevents moisture and dust contamination while the aviation aluminum base collar dissipates thermal load continuously.
  • Discrete Professional Voltage Architecture: Three dedicated factory driver board configurations: 6-15VDC (passenger cars, motorcycles, classic vintage systems), 12-36VDC (heavy-duty trucks, commercial trailers, coaches), and 48-80VDC (electric industrial equipment, warehouse electric forklifts, golf carts).
  • Rich Monochromatic Color Spectrum: Available in 6500K Daylight White (reverse/DRL), 3000K Warm White, Amber Yellow 595-600nm (turn indicators), and Red 620-630nm (tail/brake lamps).
  • Solid-State Durability: Eliminates fragile tungsten filaments that rupture under severe chassis vibration and rough road transit.

Comprehensive Vehicle Compatibility & Load Resistor Wiring

Automotive & Commercial Vehicles

Widely fitted in passenger cars, delivery vans, pickup trucks, and 24V commercial haulers for rear turn indicators, high-mount center stop lamps, and bright backup lighting.

Motorcycles & Powersports

Compact 25mm diameter fits tight motorcycle and scooter turn signal housings with instant LED flashing speed for higher rider conspicuity.

Industrial Forklifts & Electric Fleets (48-80VDC)

Dedicated 48-80V internal driver handles battery voltage fluctuations on warehouse electric forklifts, airport ground tugs, and AGV safety beacon towers.

B2B Wholesale Customization & Factory Policies

As a direct LED bulb manufacturing facility in Dongguan, China, we support flexible volume customization for global wholesalers, distributors, and fleet retrofitter brands:

  • Base Customization: Precision nickel-plated brass bayonet bases in BA15S, BAU15S, BAY15S, or BAY15D.
  • Dedicated Voltage Configurations: Independent circuit layouts optimized specifically for 6-15V, 12-36V, or 48-80V DC systems.
  • External Resistor Bundling: Optional gold aluminum clad load resistors (25W-10Ω for 12V / 25W-27Ω for 24V) with quick-splice T-taps.
  • Packaging & Private Label: Neutral bulk industrial packaging, anti-static polybags, or customized blister card retail packs.

Frequently Asked Questions

What OEM halogen bulbs does the 1156-39L directly replace?
The 1156-39L directly replaces single-filament incandescent P21W bulbs (1156 BA15S with 180° parallel pins) and PY21W amber bulbs (1056 BAU15S with 150° offset pins). An optional BAY15D version is also available for 1157 (P21/5W) dual-contact applications.
Is the 1156-39L bulb CANBus error-free, and how do I prevent hyper-flashing on turn signals?
The 1156-39L utilizes a standard 3.0W non-CANBus solid-state driver. When replacing turn signal bulbs on modern vehicles with sensitive bulb-out detection systems, an external 25W load resistor is recommended: use 25W 10-Ohm for 12V systems, and 25W 27-Ohm for 24V commercial vehicle systems.
Can this bulb be installed in 48V or 80V electric warehouse forklifts and AGVs?
Yes. We offer a dedicated 48-80VDC factory driver option specifically engineered for electric warehouse forklifts, material handling tugs, and battery-powered industrial utility vehicles, providing robust protection against DC traction motor transient spikes.
What is the official B2B wholesale MOQ and custom packaging policy?
Standard neutral factory packaging is available from 5 pairs for evaluation testing. For private-label custom branding (custom blister card or four-color retail box), the minimum initial packaging print run is 5,000 pieces, which is pre-funded and stored in our warehouse, then drawn down across repeat production batches.