1. Engineering & Optical Overview
The T18C-20L BA15d LED Bulb is engineered by MIDCARS as an industrial-grade, multi-voltage miniature lighting solution for marine vessels, railway rolling stock, and industrial automation equipment. Featuring a cylindrical array of 20x high-efficiency SMD 3014 LEDs encapsulated within a crystal-clear, shatterproof polycarbonate (PC) protective envelope, it provides uniform 360-degree radial illumination delivering 150 lumens at an ultra-low energy draw of just 2.0W.
Unlike fragile glass incandescent miniature bulbs prone to filament rupture under persistent vibration, the solid-state architecture and rugged nickel-plated brass bayonet base withstand extreme mechanical shock, continuous maritime vibration, and frequent power cycling. Designed for global B2B procurement, this bulb is supplied in factory-calibrated discrete voltage versions covering marine low-voltage DC (10-36VDC), railway standard DC (75VDC), and industrial plant mains (100-130VAC and 200-240VAC).
2. 360° Cylindrical Optical Dispersion Architecture
Equipped with 20 SMD 3014 emitters positioned around the perimeter and top of the internal pillar, the T18C-20L produces complete omni-directional light distribution without dark zones. The optical dispersion matches traditional filament focal centers, making it a drop-in replacement for navigation light fixtures, bulkhead lights, signal tower lenses, and reading lamps.
- Shatterproof PC Protective Enclosure: Resists maritime salt fog, moisture ingress, and thermal stress while preventing glass fragmentation hazards.
- Double-Contact Bayonet Base (BA15d): Standard 15mm barrel with dual bottom contacts and parallel locating pins ensures firm locking contact resistant to vehicle and engine vibration.
- High Luminous Efficacy: 150 lumens at 2.0W consumption delivers over 80% energy savings compared to 15CP/21CP incandescent predecessors.
- Available in Multiple Optical Spectra: 6500K Xenon White for crisp technical signaling; 3000K Warm White for living quarters and cabin berths; custom red, amber, and green available upon request.
3. Multi-Voltage Discrete Power Engineering
To ensure maximum electrical safety and circuit compatibility, MIDCARS engineers dedicated internal driver circuits for distinct industrial applications:
- 10-36VDC Low-Voltage Version: Non-polarity constant-current driver tailored for 12V and 24V marine battery systems, solar storage loops, and commercial watercraft navigation lights.
- 75VDC Railway Version: High-voltage discrete DC architecture engineered specifically for locomotive cab lighting, passenger car interior indicators, and railway auxiliary circuits.
- 100-130VAC & 200-240VAC Mains Versions: AC-rectified constant-current circuits engineered for machine tool status indicators, industrial control panel pilot lamps, stack lights, and marine switchboards.
4. Industrial & Maritime Equipment Cross-Reference
The BA15d (Bayonet 15mm Double-Contact) standard is widely deployed across marine vessels, rolling stock, and factory automation equipment. The T18C-20L directly replaces the following standard commercial bulb codes:
- Marine & Automotive: BA15d, 1142, 1004, 1076, 90, 94, 68, 1130, 1158, 1176, 1178, 1196, 1376.
- Industrial Automation & Control: Stack light indicator lamps, pilot signal lights, CNC machine tool operator panels, and elevator status panels requiring 24V, 110V, or 230V BA15d miniature bulbs.
- Railway & Rolling Stock: Interior ceiling berth lamps, step-well lights, locomotive gauge illumination, and control desk pilot lights operating on 75VDC or 110VAC/DC.
5. Primary Industrial & Commercial Application Scenarios
Marine Vessels & Commercial Watercraft
Anchor lights, masthead lights, stern running lights, cabin interior downlights, and engine room bulkhead lamps on 12V/24V electrical loops.
Railway Passenger Cars & Locomotives
Auxiliary electrical loops, carriage berth reading lights, instrument cluster backlighting, and emergency indication lamps on 75VDC circuits.
Industrial Machine Tools & Signal Towers
Andon stack lights, CNC operator warning columns, switchgear pilot panels, and industrial control cabinets operating on 24V, 110V, or 230V.
Specialized OEM Equipment Fixtures
Medical examination lights, vintage lighting restorations, and heavy-duty enclosed fixtures demanding vibration-proof miniature bayonet lamps.
6. B2B OEM & Custom Manufacturing Capabilities
As a source manufacturing facility in Dongguan, China, MIDCARS supports customized configurations for commercial fleet operators, marine hardware distributors, and electrical assembly manufacturers:
- Custom Voltage Calibration: Tailored driver designs for non-standard DC or AC operating voltages with enhanced voltage surge suppression.
- Optical Spectrum Customization: Monochromatic signaling colors including Amber (595nm), Maritime Red (625nm), Signal Green (525nm), or Aviation Blue.
- Enclosure & Packaging: Clear PC or milky diffused PC covers; OEM blister card packaging or custom 10-pack bulk industrial cartons with client branding.
7. Frequently Asked Questions (FAQ)
Each voltage rating uses a distinct internal constant-current driver. For marine boats and 12V/24V battery systems, specify 10-36VDC. For railway locomotive and carriage circuits, specify 75VDC. For factory automation and building power, specify 100-130VAC or 200-240VAC. Please verify your fixture supply voltage before placing orders.
All three share a 15mm base diameter. BA15d has dual bottom contacts and parallel side pins (pins at identical height). BA15s has a single bottom contact and parallel pins. BAY15d has dual contacts with offset (staggered height) pins. The T18C-20L uses the standard BA15d base with parallel pins.
Yes. The shatterproof polycarbonate envelope protects internal components from salt fog corrosion and splash water, while the solid-state SMD emitters eliminate fragile filaments, providing reliable operation under continuous maritime vibration.
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.