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How Do LED Projector Headlights Control the Beam Pattern?

In a common LED projector design, three parts work together to control the beam: a reflector that gathers the LED's light, a shield that cuts off the top of the beam, and a lens that projects the result onto the road. The shield's edge becomes the sharp cut-off line you see on a wall, and alignment decides where that line lands. Designs vary between manufacturers; this guide explains the reflector, shield and lens arrangement.   Key Facts   •      A common projector design uses a reflector, a cut-off shield and a lens; the lens projects an inverted image of the shield edge. •      Bi-LED projectors give dipped and main beam from one unit. •      UK dipped beams are asymmetric for left-hand traffic, rising towards the nearside kerb. •      MOT testers check that the dipped cut-off sits between the 0.5% and 2.75% lines (centre height up to 850 mm). •      Complete ...
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Headlight Control Module & Xenon Ballast Failure: Symptoms, Causes and Solutions

There are many reasons why your car headlight bulbs may fail. Maybe it’s because of the headlight control modules or perhaps the Xenon/HID ballasts are failing themselves. By taking a closer look at ballast failure symptoms, you can identify the fault and find the correct replacement ballast or headlight control module.   Let’s take a closer look at the symptoms and the usual culprits, along with the solutions to get your headlights working properly again.   Symptoms of a failing headlight control module   How can you tell if your headlight control modules or Xenon/HID ballasts are starting to fail? Pay attention to how your car headlight bulbs behave when you switch them on and after they’ve been running for a while. Watch out for these symptoms: ·      One or both headlights start flickering after warming up. ·      Your headlights take several seconds or a few attempts to ignite. ·      One...
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Headlight LED Bulb Not Working? Common Causes and Solutions

  Is your headlight LED bulb not working as it should? In many cases, trouble with car headlight bulbs comes down to incorrect installation. Anything from reversed polarity to loose connections and poor bulb alignment can cause the problem.   CANBUS compatibility issues   If you drive a modern vehicle, it may be using a CANBUS system to monitor the headlight circuit. The unit monitors how much power each headlight LED bulb draws to check whether it is working correctly. The system may incorrectly register that an LED bulb has failed since it uses less power than a halogen bulb. This can trigger a dashboard warning light or cause the bulb to switch off shortly after you turn it on.   The fix depends on your vehicle. In some cases, you should be able to solve the problem by installing LED bulbs with built-in CANBUS error-cancelling technology. Other vehicles may need load resistors or anti-flicker harnesses to provide the electrical load that the CANBUS sys...
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Common Mistakes When Buying LED Headlight Bulbs

The sheer number of choices can make shopping for a new LED headlamp for your car very confusing, especially because many of them make the same claims about brightness and lifespan, along with plug-and-play installation. The problem is that those claims don't tell you whether the bulb will work properly in your vehicle, so you might make mistakes such as:   Choosing the wrong bulb size   Different bulbs are designed for different applications, so an H11 LED bulb isn't built the same way as an H4 dual-beam bulb. The type of headlight housing your vehicle uses affects which bulb performs best.   So before you order an LED headlamp for your car, check your vehicle's handbook or confirm the correct bulb size.   For example, 9005 (HB3) bulbs are commonly used for high beams because they produce a bright, focused beam that reaches further down the road. Meanwhile, you can fit 9006 (HB4) bulbs to low beams or fog lights, where a wider, softer beam helps im...
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How to Replace OEM Xenon Bulbs in D1S and D2S Headlight Systems

  Table of contents: ·        Safety tips before replacing your OEM xenon headlights ·        Understand the parts you’re replacing ·        Step-by-step guide to replacing OEM xenon bulbs ·        Buy high-quality xenon HID bulbs ·        FAQs     Did your vehicle come with Xenon HID headlights? Your bulbs should usually last somewhere between 2,000 and 3,000 hours. You may notice weaker light output or a pinkish tint as they age, indicating that they are nearing the end of their lifespan.   You don’t need to wait for your xenon bulbs to stop working before replacing them. Change the OEM bulbs once the light starts fading so you can keep clear visibility at night and in poor weather.   In this guide, you’ll learn:   •          Important safe...
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