1. Introduction
This manual provides comprehensive instructions for the LEMENG 12V BA15D LED Bulb. These bulbs are designed as energy-efficient replacements for traditional halogen bulbs in various low voltage applications. They feature a 3W power consumption, 300 lumens brightness, and a warm white color temperature of 2700K. Compatible with both AC10-18V and DC10-30V systems, they are ideal for interior lighting in RVs, campers, marine vessels, boats, and trailers. The BA15D double contact bayonet base ensures broad compatibility with fixtures designed for 1076, 1142, 1176, 1004, 90, 1130, and 1075 S8 bulb types.
2. Important Safety Information
- Voltage Compatibility: These bulbs are designed exclusively for 12V and 24V low voltage lighting systems. DO NOT install them in 120V household electrical fixtures, as this will damage the bulb and may pose a safety hazard.
- Base Type Verification: Always verify that your fixture requires a BA15D double contact bayonet base. This bulb is not compatible with BA15S (single contact) or BAY15D (offset pins) bases.
- Power Disconnection: Before attempting any installation or replacement, ensure the power supply to the fixture is completely disconnected to prevent electrical shock.
- Handling: Handle bulbs by their base to avoid touching the LED components directly.
- Professional Consultation: If you are unsure about the correct voltage or installation procedure, consult a qualified electrician or technician.
3. Product Overview

Image showing the LEMENG BA15D LED bulb with its dimensions (0.63 inch width, 2 inch height) and a comparison of Color Rendering Index (CRI) values, highlighting CRI 85+.

Detailed view of the BA15D double contact bayonet base, illustrating the parallel pins and precise dimensional measurements for proper fit.
The LEMENG BA15D LED bulb is constructed with a ceramic body for efficient heat dissipation and a PC cover for durability. It features multiple LED chips arranged to provide a 360-degree beam angle. The bulb is designed for low voltage systems (AC10-18V & DC10-30V) and offers a warm white light at 2700K with a high Color Rendering Index (CRI) of 85Ra, ensuring accurate color representation. It is a non-dimmable bulb.
4. Setup and Installation
- Power Off: Ensure the power supply to the light fixture is completely turned off at the circuit breaker or switch before beginning installation.
- Verify Base Type: Confirm that your existing bulb or fixture requires a BA15D double contact bayonet base. The pins on the base of the LEMENG BA15D LED bulb are parallel.
- Remove Old Bulb: Carefully remove the old bulb from the fixture. Allow it to cool if it was recently in use.
- Insert New LED Bulb: Align the two parallel pins of the new LEMENG BA15D LED bulb with the slots in the fixture's socket. Push the bulb gently into the socket and twist it clockwise until it locks securely into place.
- Restore Power: Once the bulb is securely installed, restore power to the fixture.
- Test: Turn on the light switch to confirm the bulb is functioning correctly.
Note: If the bulb appears to wobble or does not make a secure connection, inspect the socket for any bent contacts. Gently adjust the contacts back towards the center using a small, non-conductive tool if necessary, ensuring power is off during this process.
5. Operating Instructions
The LEMENG 12V BA15D LED Bulb operates as a standard on/off light source. Simply use the existing light switch in your fixture to turn the bulb on or off. This bulb is non-dimmable. Attempting to use it with a dimmer switch may result in flickering, damage to the bulb, or improper operation.

Examples of the LEMENG BA15D LED bulbs providing illumination in a boat, RV interior, and RV exterior at night.

Further examples of the bulbs in use, showing interior lighting in a travel trailer and ambient lighting for an outdoor camping setup.
6. Maintenance
- Cleaning: To clean the bulb, ensure the power is off and the bulb is cool. Gently wipe the PC cover with a soft, dry, lint-free cloth. Avoid using liquid cleaners or abrasive materials.
- Longevity: These LED bulbs are designed for a long operational lifespan, reducing the need for frequent replacements.
- Storage: If storing unused bulbs, keep them in their original packaging in a cool, dry place to protect them from dust and damage.

The LEMENG BA15D LED bulb providing bright, warm illumination from an installed RV ceiling light fixture.
7. Troubleshooting
- Bulb Does Not Light Up:
- Check if the power supply to the fixture is on.
- Ensure the bulb is correctly seated and twisted into the BA15D socket.
- Verify that the fixture's voltage matches the bulb's requirements (AC10-18V or DC10-30V).
- Test the bulb in another compatible fixture if available.
- Bulb Flickers or Buzzes:
- This bulb is non-dimmable. Ensure it is not connected to a dimmer switch.
- Verify the power supply is stable and within the specified voltage range.
- Bulb Wiggles in Socket:
- With power off, carefully inspect the socket's internal contacts. If they are bent outwards, gently bend them back towards the center to ensure a snug fit for the bulb's pins.
8. Specifications
| Brand | LEMENG |
| Model Number | LM-BA15DW-3W |
| Light Type | LED |
| Wattage | 3 Watts |
| Brightness | 300 Lumens |
| Color Temperature | 2700 Kelvin (Warm White) |
| Voltage | AC10-18V & DC10-30V |
| Bulb Base | BA15D (Double Contact Bayonet) |
| Bulb Shape Size | S8 |
| Incandescent Equivalent | 30 Watts |
| Color Rendering Index (CRI) | 82 |
| Material | Ceramic + PC Cover |
| Item Dimensions (W x H) | 0.63" x 2.0" |
| UPC | 723990687968 |
| Dimmable | No |
9. Warranty and Support
Warranty: This LEMENG LED bulb comes with a 2-year warranty from the date of purchase, covering manufacturing defects and performance issues under normal use conditions.
Customer Support: For any questions, concerns, or warranty claims, please contact the seller directly. Our customer support team aims to respond to all inquiries within 24 hours to provide assistance.