Product Overview: BA9s T4W Miniature Bayonet LED Indicator Bulb
The MIDCARS T4W-4L is an industrial- and automotive-grade BA9s (T4W) miniature bayonet LED indicator bulb engineered for seamless 1:1 direct replacement of conventional incandescent pilot bulbs, automotive instrument lamps, and industrial control panel signal lights. Featuring an ultra-durable transparent polycarbonate (Clear PC) protective enclosure and dual-face mounted high-efficiency SMD 2835 LEDs (Ra ≥ 80), it produces uniform 360-degree cylindrical light diffusion without dark spots or shadows.
Designed to solve the frequent burnouts, high power draw, and excessive heat generation of traditional incandescent filaments, this solid-state LED module draws only 0.6W to 1.0W while delivering 50 to 90 Lumens of crisp, vibrant illumination. Available in multiple precision-regulated voltage configurations—including 12V/24V for automotive and commercial vehicles, 28V for heavy-duty, marine, and aviation panels, and 110V-130V AC/DC and 200V-240V AC (Custom DC available) for industrial machinery and switchgear—it provides an exceptional operating lifespan backed by our 2-year factory warranty.
Precision Dimensions & Base Fitment Specifications
Engineered with strict OEM miniature bayonet dimensional tolerances (Diameter: 10.0 mm, Overall Length: 28.0 mm, Base Diameter: 9.0 mm with dual 180° symmetrical locking pins and single bottom contact). In addition to standard BA9s, pin-offset bases including BAX9s (150°) and BAY9s (120°) are available to fit specialized European vehicle fixtures and industrial sockets:
Real Illumination & Multi-Color Light Output
High-transparency optical polycarbonate tube provides continuous 360-degree cylindrical light diffusion, ensuring bright, visible illumination across pilot lens caps and indicator lenses:
Broad Industrial & Automotive Applications
- Automotive & Motorcycle Lighting: Gauge cluster illumination, speedometer/tachometer backlighting, glove box lights, dome reading lamps, license plate lights, side marker indicators, and parking lights.
- Industrial Control Panels & Switchgear: Direct LED retrofit for 22mm push button pilot lights (such as Schneider Electric Harmony XB4 / XB5 series, Telemecanique ZB2), electrical distribution switchboards, and HVAC status indicators.
- Commercial Trucks, Buses & Heavy Machinery: 24V-28V instrument cluster indicators, warning pilot lights, and cab auxiliary lighting for commercial transport.
- Aviation & Marine Electronics: 28V cockpit panel indicators, navigational instrumentation, marine switchboard indicators, and marine radio console backlighting.
- Classic Electronics, Flashlights & Appliances: Vintage audio receiver meter backlighting, pinball machine playfield lamps, testing equipment indicators, and heavy-duty portable inspection lanterns.
Key Features & Engineering Advantages
- Shatterproof PC Construction: Clear polycarbonate shell protects surface-mount components against vibration, physical shock, and accidental damage during installation.
- Substantial Energy & Heat Reduction: Operates at approximately 80% lower wattage than 4W-5W incandescent filaments, preventing lens deformation and melted plastic sockets.
- 30,000+ Hours Operational Lifespan: Dramatically reduces maintenance downtime and bulb replacement frequency in difficult-to-reach industrial panels and automotive dash clusters.
- Instant-On Illumination: Zero warm-up latency; provides immediate maximum visibility for critical alarm indicators and automotive warning signals.