1. Introduction
The Philips Ultinon Rally 3551 LED Headlight is designed to provide powerful, stylish, and bright white LED light for your vehicle. Featuring a smart AirCool+ cooling system and Philips' renowned quality design, these headlights offer ultra-high brightness and lasting performance.
This manual provides essential information for the safe and effective installation, operation, and maintenance of your Philips Ultinon Rally 3551 LED Headlights.
Video: Philips Ultinon Rally 3551 promotional video showcasing features like brightness, color temperature, cooling, and different socket types.
2. Safety Information
WARNING: These lamps are not permitted for use on public roads in the EU (off-road / show use only). It is your own responsibility to ensure that the use of LED retrofit lights complies with applicable local legal requirements.
- Always disconnect the vehicle's battery before attempting any electrical installation or maintenance.
- Wear appropriate personal protective equipment, including safety glasses and gloves, during installation.
- Avoid touching the glass part of the LED bulb directly with bare hands, as oils can reduce bulb lifespan.
- Ensure the headlights are securely mounted and properly aimed to prevent glare for other drivers.
- Keep the product out of reach of children.
- Do not disassemble or modify the LED bulbs, as this may void the warranty and create safety hazards.
3. Package Contents
Your Philips Ultinon Rally 3551 LED Headlight package should contain the following items:
- 2 x Philips Ultinon Rally 3551 LED Headlight Bulbs (H4)
- Associated wiring/drivers (integrated or external, as per design)
- Instruction Manual (this document)
Image: Product packaging and components, showing two LED bulbs and their drivers.
4. Specifications
Image: Product Parameters table for H4, H7, HIR2, H11, HB3/4 models, showing Volt, Watt, Lumens, Lifetime, Color Temperature.
| Feature | Specification |
|---|---|
| Model | H4 (9003/HB2 Hi/Lo) |
| Voltage | 12V-24V |
| Wattage | 50W per lamp (100W per pair) |
| Lumens | 4000/2600LM per lamp (8000/5200LM per pair) |
| Color Temperature | 6500K (Pure White) |
| Lifetime | Up to 1500 hours |
| Base Type | P43t |
| Certification | CE |
| High-concerned chemical | None |
| Origin | Mainland China |
| Package Dimensions (L x W x H) | 19 cm x 18 cm x 6 cm |
| Package Weight | 0.329 kg |
| SKU | LUM11342U3551X2 |
5. Installation
The Philips Ultinon Rally 3551 LED Headlights are designed for a plug-and-play installation in compatible vehicles. Always refer to your vehicle's owner's manual for specific headlight replacement procedures.
- Prepare Your Vehicle: Ensure your vehicle is turned off and the engine is cool. Disconnect the negative terminal of the car battery to prevent electrical shorts.
- Access Headlight Assembly: Locate the headlight assembly. Depending on your vehicle model, you may need to remove certain components (e.g., grille, bumper, or fender liner) to access the rear of the headlight.
- Remove Old Bulb: Disconnect the electrical connector from the existing halogen bulb. Unclip or twist to remove the old bulb from its housing.
- Install LED Bulb: Carefully insert the Philips Ultinon Rally 3551 LED bulb into the headlight housing. Ensure it is seated correctly and secured with the retaining clip or twist mechanism. Do not force the bulb.
- Connect Wiring: Connect the electrical connector from the vehicle's wiring harness to the LED bulb's driver/connector. Ensure a secure connection.
- Test Functionality: Reconnect the car battery. Turn on your vehicle's headlights to test the new LED bulbs. Check both low beam and high beam functions.
- Adjust Beam (if necessary): If the light pattern appears incorrect or causes excessive glare, adjust the headlight aim according to your vehicle's specifications. Professional adjustment is recommended.
Image: Durable Performance with AirCool+ technology, showing liquid cooling pipe and built-in quiet fan, which aids in the longevity of the LED bulb.
6. Operation
Once installed, your Philips Ultinon Rally 3551 LED Headlights will operate like your original headlights, providing enhanced illumination.
- High Brightness: Experience significantly brighter light output (up to 4000LM per bulb) for improved visibility on the road.
- Cool White Light: The bulbs produce a 6500K pure white light, offering a modern aesthetic and enhanced contrast for recognizing obstacles and road signs.
- Wider Usability: Compatible with both 12V and 24V electrical systems, making them suitable for a broad range of vehicles.
Image: Powerful Lighting Output, demonstrating how 50W High Watt & 4500LM High Lumens improve visibility on the road.
Image: Up To 6500K White Light, illustrating the difference in color temperatures from yellow to pure white.
Image: Key features of the Philips Ultinon Rally 3551 LED Headlights, highlighting brightness, color, lifetime, and voltage compatibility.
7. Maintenance
Philips Ultinon Rally 3551 LED Headlights are designed for durable performance and a long lifespan of up to 1500 hours, requiring minimal maintenance.
- Cleaning: If necessary, gently wipe the exterior of the headlight lens with a soft, damp cloth. Avoid abrasive cleaners or harsh chemicals that could damage the lens or LED components.
- Inspection: Periodically check the headlights for any signs of damage, loose connections, or dimming.
- Cooling System: The integrated AirCool+ technology manages heat effectively. Ensure that the area around the headlight assembly is free from debris that could obstruct airflow to the fan.
8. Troubleshooting
If you encounter issues with your Philips Ultinon Rally 3551 LED Headlights, consider the following common solutions:
- Headlight Not Turning On:
- Check all electrical connections to ensure they are secure.
- Verify that the vehicle's fuses related to the headlights are intact and not blown.
- Ensure the LED bulb is correctly seated in the housing. - Flickering or Intermittent Operation:
- This can sometimes be caused by voltage fluctuations. Ensure your vehicle's electrical system is stable.
- Check for loose connections at the bulb or driver. - Incorrect Beam Pattern or Glare:
- Ensure the LED bulb is oriented correctly in the headlight housing. Some bulbs have specific rotational requirements.
- The headlight aim may need adjustment. Consult a professional for proper headlight alignment. - One Bulb Out, One Working:
- Swap the bulbs between the left and right sides to determine if the issue is with the bulb itself or the vehicle's wiring/power to that side.
If these steps do not resolve the issue, please contact Philips customer support for further assistance.
9. User Tips
- Quantity Clarification: The Philips Ultinon Rally 3551 LED Headlights are sold as a pair (2 bulbs) to ensure consistent lighting performance for both headlights.
- Verify Authenticity: To ensure you receive genuine Philips quality, purchase from authorized retailers. The product is backed by Philips' reliable quality standards.
- Local Regulations: Always double-check your local vehicle lighting regulations before installing these headlights, especially if you intend to use them on public roads, as they may not be ECE compliant in all regions.
10. Warranty and Support
Your Philips Ultinon Rally 3551 LED Headlights come with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects under normal use.
For warranty claims, technical support, or any questions regarding your product, please contact Philips customer service through their official channels. Keep your proof of purchase for warranty validation.
