Do LED Bulbs Work in Projector Headlights?

Move over HIDs, there’s a new type of headlight in town.

Light-emitting diodes (LEDs) have already overtaken CFLs to become the most popular type of interior lighting. It seems that this trend is set to expand into the world of headlights.

LEDs are a brighter, more efficient alternative to HID and halogen bulbs in vehicle headlights. Research indicates that in 2019 around 86% of cars were using LED bulbs in their headlights, an increase of 31% from 2018. But LED bulbs can only be used in projector headlights, and continue to be unsafe to use in reflector headlights.

Vehicle headlights have certainly come a long way since traditional tungsten filament lamps. But is it true that brighter is always better?

In this article, I’ll be exploring the brightness of LED bulbs, how LEDs compare to HIDs, and the most efficient headlight brightness.

Are LEDs Bright Enough To Be Used In Projector Headlights?

Let’s start by divulging what is meant by ‘projector headlights.’

Projectors are a relatively new type of headlight housing, first introduced in the 1980s. They consist of a light set inside a metal bowl, mirrored reflectors, a shutter, and a lens.

The shutter is used to cut off haphazard beams so that light is only directed at the road, and other drivers aren’t blinded. The lens, whereas, is rounded so that it intensifies the beam of light.

Unlike projectors, reflector headlights do not contain a shutter or specialized lens, which means the beams they emit are wider, albeit less focused. LED bulbs, therefore, cannot be used in reflector headlights, because the light is scattered and may dazzle other drivers.

Nevertheless, projector headlights have typically used halogen or HID bulbs, so how do LEDs compare?

LEDs are up to 300% brighter than standard halogen bulbs, and around the same level of brightness as HIDs. So LEDs are definitely bright enough to be used in projector headlights.

However, LEDs are criticized for their inability to illuminate long distances. Most LED bulbs have very intense foreground beams but struggle to project further away, resulting in safety concerns.

Even with the new technology, low beam headlights don’t always provide enough forward seeing distance for the driver to react to an object in the road and stop in time. Jennifer Stockburger - Consumer Report

It’s easy to see why this is a downfall. At high speeds, this lack of projection means that LEDs can have potentially fatal consequences.

LED vs HID: Which Is Better For Projector Headlights?

projector headlight

Back in the 1900s, when electric headlights were first invented, halogen bulbs were the norm. During the 1990s, halogens were gradually replaced by HIDs, and more recently, by LEDs. But which is better?

High-intensity discharge (HID) bulbs are often referred to as xenons. They consist of two tungsten electrodes inside a capsule that is filled with xenon and metal salts.

When an electric current is sent through the electrodes, a reaction occurs, and the metal salts evaporate to form a light-emitting plasma.

The result is a light that is three times brighter than traditional halogens. HIDs are also favored because they’re more energy-efficient, using 35w of power.

However, the downside of HIDs is that they do not provide instantaneous light.

Most HIDs take between 10 and 20 seconds to achieve full brightness. This is a definite disadvantage in emergency and restricted vision scenarios.

On the other hand, LEDs produce light using a semiconductor. LEDs were first seen in car headlights in 2006 with the Lexus LS 600h.

More recently, in 2013, Audi introduced a system that uses 25 individual LEDs per headlight.

Improvements in technology mean that LEDs are even more efficient than HIDs, using 15 to 18w of power. Likewise, LEDs have unmatched longevity, and will often outlive the vehicle itself.

Unlike HIDs, LEDs do not require any time to start up and can go from dark to full brightness immediately.

The problem with retrofitting LED bulbs into projector headlights is the need for a heat sink. Located at the back of the bulb in the engine bay, this heat sink is usually around an inch long. But this limits the ability of manufacturers to make LEDs for specific car makes and models.

All-in-all it’s fair to say that LED bulbs are preferable to HIDs in projector headlights due to their increased brightness, longevity, efficiency, and immediate start-up.

But the requirement of a heat sink means that LEDs may not be available for all vehicles.

Here is the video that expands more on that topic.

What Brightness Is Best For Headlights?

The goal of a headlight is to provide enough light that you can see the road ahead, but not too much light that you blind other drivers.

The brightness of a bulb is measured in lumens. Traditional halogen bulbs emit around 1300 lumens, which is perceived as adequate. However, the introduction of HID bulbs that emit around 3000 lumens was a welcomed innovation, and drivers praised the increased visibility they provided.

But with the growing prevalence of LED headlights comes another lumen increase. LED bulbs typically emit 2000 to 4000 lumens and have cooler color temperatures. This bears the question: “how bright is too bright“?

A study by RAC found that 65% of motorists have been dazzled by LED lights, even when they are dipped!

Headlights should allow you to see objects that are at least 50 to about 100 meters ahead, but any more and become dangerous.

Dazzling other drivers can cause them to temporarily lose sight of the road, which increases the risk of an accident.

  Halogen HID LED
Lumen Output 1300 3000 2000 – 4000
Colour Temperature (Kelvins) 3200K 4500K 6000K


What Types of LED Lights Works Best With Projector Headlights?

If you’ve weighed up the pros and cons and decided you want to upgrade your headlights to LEDs, you have two choices.

Firstly, you can purchase an LED replacement kit. Intended to be quick and easy to install, these plug and play kits can be directly swapped over from old halogen bulbs.

With replacement kits, the most common type of bulb is an H7 LED.

SuperBrightLEDs have a handy resource that allows you to input the year, make and model of your car to find the best LED replacement.

Alternatively, you can buy an entirely new headlight fixture complete with LED bulbs.

The benefit of this method is that you don’t have to worry about bulb compatibility or size, but this option will be more expensive.

With either approach, it’s essential to be mindful of the law.

Every region has its own road safety laws. Still, some are stricter about the maximum brightness and color temperature of LED bulbs. In some places, headlight modifications are even entirely outlawed.

If you have decided to give LED lights a go, please ensure you are only buying high quality certified lights from renowned retailers.

I would recommend checking out LED headlights from These guys are specializing in LED lighting systems for cars, so their products meet all safety standards.

Final Words

It’s fair to say that headlights have indeed become brighter and whiter over the last two decades. As the use of halogens continues to dim, we can expect this trend to continue.

In fact, in 2014, Audi introduced laser headlights that claim to be twice the range of even the brightest LED.

What’s your opinion – are bright LEDs the way forward, or do they constitute a safety hazard? Does your area have any peculiar laws relating to headlights?

Leave a comment down below.

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6 thoughts on “Do LED Bulbs Work in Projector Headlights?”

  1. I installed LED bulbs on projector headlamps and they were not as bright as halogen bulbs. I then installed 6000k HIDs and they were awesome.

    • Hi Raul,

      Thanks for sharing that. As I said in the article, it is key to select the correct temperature as well as lumen output. Can you share with us what car did you install it on?


  2. A lot of people are deceived by the marketing of many companies when it comes to LED Headlights. People see that an LED H11 Low Beam bulb emits 4000 to 12000 Lumens and they are immediately sold. The standard Halogen H11 bulb emits roughly 1500 Lumens only. But in reality, a standard Halogen bulb which emits only 1500 Lumens can provide more visibility on a pitch dark road than an LED H11 bulb which emit 4000 Lumens. The reason being is that the Halogen bulb may only emit 1500 Lumens but its LUX rating is 300 LUX whereas the LED bulbs which are 4000 to 12000 Lumens have a LUX rating of only 200 LUX.

    I have discovered that any company or article which advertises LED bulbs with Lumen ratings only, is most likely knowingly deceiving individuals into believing that they are buying a superior product in terms of visibility as compared to the standard Halogen bulb.

    I recommend that people do there own research and search “LUX versus Lumens H11 Low Beam Headlights” and educate themselves on the difference between the two, before wasting money on any LED Low Beam headlight bulbs which advertise there product in Lumens only rather than LUX. I would also search for “LED H11 Low Beam Bulb in Projector versus Reflector Housing”.

    • Hi Sam,

      Thanks for your input, but I don’t agree with that to the full extent and here is why. You are right that we should account for Lux when selecting or replacing a headlight with LED, but this is just one piece of the puzzle.

      The thing is, you have LED lights with poor beam focus pattern as well as you have lights with well optimized beam pattern. Now, usually cheaper LED headlights that are rated as universal or compatible with lots of different cars are designed in a way that the light they emit is just too spread and the headlights reflector cannot focus it correctly on the road thus reducing the lux output.

      On the other hand you have bunch of LED lights that are bright but also the beam they emit initially is designed specifically so that the reflector in the given car helps to maximize the lux output of the light. This being said, yes you should consider the lux of the headlight, but this information is not given at the specs sheet as each car will have different value.

      You need to account for the reflector of the car as it plays the massive role when it comes to the road illuminance. It is always better to buy the LED headlight that is specifically designed for your car because then you know that it will work well with you specific housing reflector to maximize the output.

      Hope that makes sense and clarifies the issue.

  3. I don’t tend to agree that no more than 100 mtr visibility of headlight is dangerous, rather on highways 100 mtr is quite inadequate. For a car going at 100km/ph this translates to around 3 seconds to react and take corrective action (including stopping) and that’s not possible or utterly dangerous.

    Even your quote of consumer report indicates towards the same in terms of inadequate reach of headlights

    • Hi

      I understand your concern, although on the highway we usually use high beam which is much brighter and has longer reach. Low beams are not simply designed to be used in high speed areas and are more for use in urban areas where speeds are not that high. In fact the quote has been referring that minimum distance needed to stop the car at the speed of 60 mph is 300 ft which equals about 91 m and many of headlights don’t reach that.

      I am not trying to convince you otherwise, but just wanted to point out my take. There must be a good balance between illuminating the road enough as well as not dazzling other drivers and I believe that soon we will be seeing more and more cars with optimized low beams.

      Thanks for your opinion.


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