1. Introduction
Thank you for choosing AHLTD Car LED Dome Festoon Reading Door Lights. These ultra-bright LED bulbs are designed to provide superior illumination for various automotive interior and exterior applications. Featuring high-quality 5050 SMD chips, they offer enhanced brightness, energy efficiency, and a long lifespan. This manual provides essential information for the proper installation, operation, and maintenance of your new LED bulbs.
2. Product Overview
The AHLTD LED Festoon bulbs are versatile lighting solutions for your vehicle. They are available in multiple lengths (31mm, 36mm, 39mm, 41mm) to fit various fixtures, making them suitable for reading lights, dome lights, door lights, trunk lamps, and license plate lights. Each bulb is equipped with multiple 5050 SMD LED chips for powerful and consistent white light output.

Figure 2.1: AHLTD LED Festoon Bulbs with Super Bright 5050 Chips
Video 2.1: Product demonstration showing the LED bulbs, installation process, and light output in a vehicle.
3. Specifications
The following table details the technical specifications of the AHLTD Car LED Dome Festoon Reading Door Lights:
| Feature | Specification |
|---|---|
| Brand Name | AHLTD |
| Model Name | 5050 9SMD |
| Item Type | Reading Lights (also Dome, Door, Trunk, License Plate) |
| Interface Type | C5W / Festoon |
| Voltage | DC 12V |
| Wattage | 3W |
| Lumens | 500 - 999LM |
| LED Bead | 3/4/6/8/9 LED SMD/SMT (5050 type) |
| Color | White (6000-6500K) |
| Sizes Available | 31mm, 36mm, 39mm, 41mm |
| Material | PBC board, Aviation Grade Aluminum (for cooling) |
| Lifespan | Up to 50,000 hours |
| Item Weight | 11g |
| OEM Number | 11B949101 |
| Vehicle Compatibility | Universal |

Figure 3.1: Available LED Bulb Dimensions
4. Setup and Installation
Before installation, ensure your vehicle's ignition is off and the light switch is in the 'off' position to prevent electrical shorts or injury.
- Identify the Bulb Type: Confirm that your vehicle uses Festoon type bulbs and measure the length of your existing bulb (e.g., 31mm, 36mm, 39mm, 41mm) to select the correct size.
- Access the Light Fixture: Carefully remove the cover of the dome light, reading light, or other fixture. This may require a small flat-head screwdriver or a plastic pry tool. Refer to your vehicle's owner's manual for specific instructions on accessing the bulb.
- Remove Old Bulb: Gently pull out the old incandescent bulb from its socket. Be cautious as it might be hot.
- Install New LED Bulb: Insert the new AHLTD LED Festoon bulb into the socket. LED bulbs are polarity sensitive. If the bulb does not light up immediately, remove it, flip it 180 degrees, and reinsert it.
- Test Functionality: Turn on your vehicle's ignition and test the light to ensure it functions correctly.
- Reassemble Fixture: Once confirmed working, carefully replace the light fixture cover.

Figure 4.1: Example of LED dome light installation area.

Figure 4.2: Visual comparison of interior lighting before and after LED bulb installation.
5. Operating Instructions
Operating your AHLTD LED Festoon bulbs is straightforward. Once installed, they will function with your vehicle's existing lighting controls. Simply use the designated switches or controls in your vehicle to turn the lights on or off. The LED bulbs will provide instant, full brightness when activated.
6. Maintenance
AHLTD LED Festoon bulbs are designed for minimal maintenance due to their long lifespan of up to 50,000 hours.
- Cleaning: If the bulb or fixture cover becomes dirty, gently wipe it with a soft, dry cloth. Avoid using abrasive cleaners or solvents, as these can damage the LED components or the fixture.
- Inspection: Periodically check the bulbs and their connections to ensure they are secure and free from corrosion.
- Replacement: Due to their extended lifespan, frequent replacement is not expected. If a bulb fails, follow the installation steps to replace it with a new one of the correct size and type.
7. Troubleshooting
- Bulb Does Not Light Up:
- Check Polarity: LED bulbs are polarity sensitive. If the bulb does not light up, remove it, rotate it 180 degrees, and reinsert it.
- Check Connection: Ensure the bulb is securely seated in the socket and making proper contact.
- Check Fuse: Verify that the vehicle's fuse for the lighting circuit is intact. Replace if blown.
- Vehicle Compatibility: Confirm that your vehicle's electrical system is 12V DC.
- Flickering or Dim Light:
- Loose Connection: Re-seat the bulb firmly in the socket.
- Voltage Fluctuation: Ensure your vehicle's battery and charging system are operating correctly.
8. User Tips
- Fitment in Recessed Areas: When installing in recessed light fixtures, carefully check the available space. Some LED board designs, particularly those with wider boards, might not fit perfectly or may interfere with the fixture's housing. It is recommended to measure the internal dimensions of your light fixture and compare them with the LED bulb dimensions (e.g., 31mm, 36mm, 39mm, 41mm lengths and board width) before purchase and installation.
- Handling: Always handle LED bulbs by their metal ends or edges to avoid touching the LED chips directly, which can transfer oils and reduce performance.
9. Warranty and Support
For any questions, technical assistance, or support regarding your AHLTD Car LED Dome Festoon Reading Door Lights, please contact the seller or manufacturer directly. Keep your purchase receipt for any warranty claims.