banner
Guangzhou LEDO Electronic Co.,Ltd > News > Tech Knowledge > How to Select the LED Projector Headlight Bulb? (2018 Upgrade)

How to Select the LED Projector Headlight Bulb? (2018 Upgrade)

663 Published by Ava 08 23,2018

We are all looking for a led headlight bulb that could produce strong hotspot, a perfect distribution of light and crisp cut-off line in xenon projector. But the inner structure of xenon projector is designed according to the focal length of the HID bulb. That means we gotta find a led headlight with similar focal length to HID bulb that most light from LED can be thrown down the road.

In this article, we will show you which led headlight work perfectly in xenon projector. And you will know the reason why this kind of led headlight works well in xenon projector so you can explore more similar led projector headlights on the market.


Here is the deal.

In this year, LED headlight is no double to be the hottest products in the automotive lighting industry. It gets the revolutionary improvement on technology to simulate the lighting of halogen bulbs. On installation, the LED headlight can replace the original halogen headlight bulbs directly, plug and play, lighting with a clear cut-off line on low beam pattern without projector lens. It isn’t like HID bulb, which has scattered lighting like a flashlight, if you don’t install a projector lens together, HID will dazzle the other drivers on the front of you, very dangerous. LED headlight has a great beam pattern in reflector bowls. Besides, a LED chip has the talents like long lifespan, low lighting decay, saving power, and less response time (while HID need at least 2 second response time while start), there are so many selling points on this product. So you can understand why LED headlight is regarded to be the future headlight to replace HID gradually.

Besides, now in this industry, we could find many new released led projectors for headlight housing from different suppliers. But installing the led projector, we need to cut original reflector to fit the projector in place. That has to have a little bit more skill and easy to damage the original headlight housing. We don’t want this. By comparison, we require a led headlight bulb directly replace the halogen bulb or HID bulb. So we need a led headlight better than HID bulb in xenon projector. So here come to a common question, what kind of led headlight fit in xenon projector?

If we want to figure it out, we need to understand how the structure of xenon projector lens is:

LED Projector Headlight Bulb

From the picture, we can see.

-  The lower surface of a projector is a shade zone; the light to this surface won’t be reflected.

-  The upper front surface is the reflector bowl surface. But on low beam pattern, light from the upper surface will be stopped by a cutoff shield.

-  The upper rear surface is also the reflector bowl surface, but, the light from rear surface won’t be stopped by the cutoff shield and can be thrown down the road on low beam pattern.

This is the inner structure of xenon projector. In order to figure out what kind of LED headlight fit xenon projector lens, we do the test below.

This is our CREE XHP50 LED headlight, named G8 led headlight, two-emitting-side, 4000Lm.

The light beam angel is shown below. It is around 320 degree.

LED Projector Headlight Bulb

As the socket of led headlight is adjustable, we can

Let ‘s try the first loading method.

LED Projector Headlight Bulb

We place Leds on left and right; put in projector lens, like the picture shown above. Let’s see the light beam pattern.

LED Projector Headlight Bulb

In this case, we see a dark spot on the center of light beam because G8 led headlight doesn’t have 360 light beam angle, light isn’t able to reach some area of reflector bowl.

We place LEDs on upper and lower.

LED Projector Headlight Bulb

Because LEDs are put on upper and lower, most light can rise on reflector bowl. There is no dark spot on beam pattern. But compared to the above case, the light is dim. That is because the light to lower surface won’t be reflected. All the light we see on the wall is reflected from the upper reflector bowl. That means 4000lumen, only 2000 lumen is used, another 2000lumen to down surface is wasted. So in this case, the light beam pattern is OK, but the light output is bad and can’t reach our requirement to replace the HID bulb.

LED Projector Headlight Bulb

After our testing above, we have a hypothesis. The light amount to upper reflected surface decides the light output of this led headlight in xenon projector.

Here is our another led headlight kit from the market, G8L LED headlight, same bulb body design to G8, Cree XHP70 LED chip, 4000 Lumen, the only different thing is the light beam angle, G8L only has one-emitting-side (180-degree light beam pattern).

LED Projector Headlight Bulb 

We will put the LED on the upper side, if our Hypothesis is correct, the light output will be strong because most of light can be reflected by the upper reflector bowl and thrown on the wall.

Like picture shown above, the brightness is improved so obviously. There is the clear cut-off line, no dark spot. 4000Lm lighting is totally reflected by projector lens and irradiated on the wall. Beam pattern is awesome, even brighter than HID. It is 439lux measured by Lux photometer, three times brighter than G8 led headlight.

LED Projector Headlight BulbLED Projector Headlight Bulb

Finally, we prove that one-emitting-side super bright led headlight is better to fit xenon projector.

Next we move to the underground garage. Here we will install G8 and G8F on car to verify our experiment result.

Experiment Subject: 2014 KIA SPORTAGE

LED Projector Headlight Bulb

This car has original HID headlamp and no retrofit history before. We will test our led headlight bulbs on this car and compare their light output.

Here we give an instruction that install led headlight on 2014 KIA Sportage. Open the lip, find the screw with red circle in the picture, take the screw out, you will be able to loose the headlamp and get enough space for your hand to replace the headlight bulbs.

LED Projector Headlight BulbLED Projector Headlight BulbLED Projector Headlight Bulb

The installation process is shown in above pictures. After finished, we measure the brightness of G8 LED headlight by professional Lux photometer. The center point of beam pattern is 210lux, while the light output on ground is 48 lux.

LED Projector Headlight BulbLED Projector Headlight Bulb

And we continue and test the G8L headlight. Same installation process. While we finish the replacement work and turn on the headlight low beam pattern, the lighting is so strong, giving an obvious comparison to G8. This is eye-can-tell brighter and stronger lighting. Very awesome! We measure by Lux photometer and know that the center point of the beam pattern is 443 lux, the light to the ground is 81 lux, double brighter than G8.

LED Projector Headlight BulbLED Projector Headlight BulbLED Projector Headlight Bulb

We believe even if we test more models, this result won’t be changed. Through analyzing the internal structure of xenon projector lens, we know most of light on the road is from the upper reflective surface of the projector, one-emitting-side headlight could throw all of the lighting on this surface to maximize the light output. That is the key point.

So G8F is better to fit the car with xenon headlamp.


We did this experiment in 2016. Now, in 2018, new generation led projector headlight bulb has been released and totally complies with xenon projector and bi-xenon projector. Compared the G8L led headlight, new led projector headlight has 4800 lumen output and produces a very wide beam pattern with a perfect distribution of light. It is truly developed according to xenon projector lens.


Wish my article will be helpful for all of people who want to modify your HID to LED headlight, helping you select right led headlight kit. If you have any question, we are welcome you to inquiry us.

What is a good headlight beam pattern? (DOT/ECE)

Standards for Headlight Beam Patterns -- edited by Kevin   This article will discuss headlight beam patterns and the standards that agencies such as ECE/DOT require. The following points will be addressed to help gain a better understanding:   1. What does the original ECE front headlight testing graphic look like? 2. The original ECE front headlight testing graphic combine with driveway image 3. Some testing points that need to pay more attention to 4. Other standards used in other countries and areas (SAE/ADR)     How do we define a safe and effective headlight beam pattern and what are the standards it has to meet? Most people would say they want a headlight that is super bright, covers a large area in front of the vehicle and has uniform illumination with no dark spots. But can this be achieved and still meet the standards set forth by ECE (E-mark) or SAE (DOT)?   The short answer is, YES! The keys to optimal performance are to be sure the light is focu...

Do you like ? 742

Read more

2018 M2 Compact & Ultra Bright LED Headlights Review Guide

This is our new M2 LED Headlight series launched on November 2018. Its single beam housing with 2 pics CR CSP led chip while the dual beam housing with 4 pics leds, M2 led headlight kit can reach 6000 Lumen output. With an advanced dynamic design, high counterclockwise and low vibration of the fan, the M2 LED Headlight to work out the issue of noise in a safe situation.   The bulb of M2 used 6003 Aluminum alloy, and bulb body is integrated by the hot-pressing process for better heat dissipation. And it is using double layer copper PCB which provides a good heat dissipation. Because of the high adhesion between the double layer copper PCB, it is beneficial to the heat dissipation and extends the lifespan of LEDs, the LED chips would not burn out easily.     All in one style, the length of the bulb body is 77mm, the width of the heat sink is 31mm. The compact bulb body is close to the halogen bulb size LED Bulb Operating Temperature Testing Testing the led bulb with 1...

Do you like ? 300

Read more

Are F2 LED Headlights Worth buying? (Test & Review 2018)

F2 led headlight was launched on September 2017. it is a high performance led headlight with fan, the double beam led bulb are designed with 4 CR CSP led chips while single beam led bulb has 2 pcs of CR CSP LEDs. The maximum light output of F2 led bulb can reach 6000 lumens.   The F2 bulb is housing one PCB board in middle with opposing LEDs on two sides that decrease the distance between two side LEDs. With this special design, it can make the thickness of light source close to the tungsten filament of the halogen bulb.   The F2 headlight using a small size fan is easy to install which would not influence to mount the dust cover. The bulb of F2 used 6003 Aluminium alloy with a decent surface treatment that creates a good texture for the bulb. Its operating power can up to 36W which will have a better canbus performance than the common 25W led headlight.     Next, we test the F2 led headlight performance, the reviews are shown as below:   LED Bulb Operating...

Do you like ? 640

Read more

Blade Led Headlight Test Report

This is Blade led headlight which was launched on May 2018. Its double beam led bulb was designed with 24 pcs of SEOUL CSP-Y19 LED CHIPS, while the single beam led bulb was designed with 12 pcs of SEOUL CSP-Y19 LED CHIPS. Take the H11 led bulb single beam as an example, its length is 87.3mm, the width of its heat sink is 32mm. For the bulb body part, the length is 41.9mm and the width is 12.mm.     Besides, the distance between opposing LEDs is 2.54mm, almost equivalent to the filament width of factory halogen bulb, which is 2mm. Generally, its volume is relatively compact compared to others fanless led headlights.     The heat sink of Blade led headlight using 6003 Aluminum alloy, heat sink and bulb body are integrated by the hot pressing process for better heat dissipation, which can’t be disassembled.   LED Bulb Operating Temperature Testing :   Testing the led bulb with 13.5-volt power supplied for 30 minutes and the room temperature is about 25 d...

Do you like ? 407

Read more

Fiberglass PCB vs. Aluminum PCB vs. Copper base PCB vs. Ceramic PCB

For the PCB boards now in application to LED headlight, there are mainly four kind of materials, Fiberglass(FR4) PCB, Aluminum PCB, Copper PCB and Ceramic PCB. It is a good deal to understand the distinctions for these four types PCB. Which PCB you choose depends on the circuit design construction of the headlight. FR4 vs. Aluminum PCB   Price Comparison In the cost comparison, the Aluminum PCB is more expensive than FR4, as well as more superior in performance.   Thermally conductivity Aluminum PCB has a great capability of thermal conductivity than FR4 which makes them play an important role in LED lighting technology.   Technology practices The thermal conductivity dielectric material of Aluminum PCB is a thermal bridge that connects the components and metal plate. It can transfer heat to the heat sink through the core automatically. An Aluminum backed PCB is assembled with aluminum backing, highly thermally conductive dielectric layer and the standard circuit lay...

Do you like ? 321

Read more

4 Simple Methods to Select the Best LED Headlight Bulbs

In this post, we will introduce to you the methods to select the best led headlight bulbs with fan or without fan from the engineer view, by analyzing what is important to a led headlight bulb, telling the methods to test the led headlight and get a conclusion from the data. And also mentioned what other factors are related to the quality of led headlight bulbs. After reading our post and follow our steps, you will be able to easily judge a led headlight is good or bad.   The Structure of this Article - 4 Simple Methods to Select the Best LED Headlight Bulbs   Three Type of Led Headlight Heat Sink - Aluminum heat sink, fan for heat sink and copper braid heat sink, what are the different among them? The pros and cons? What Should We Concern on When Picking Fanless Led Headlight Bulbs? - Led Chips, bulb size, or Lumen output? All these info are told by the seller, but what should we concern on when picking fanless led headlight bulb? How to Choose the Best Fanless Led Headli...

Do you like ? 588

Read more

Genuine G7 PK Fake G7 – How to Reduce Product Cost?

I think many people will meet this situation while shopping two similar products but with a great difference on prices.it is hard to make a choice for you, because you want to purchase the cheaper one but also worry about its quality as well. It is saying that you get what you pay. This is the best description of the current electronic products industry condition in China. Even high-value product like the laptop, or a cheap product like power bank or led light, we can find many similar products from different manufacturers. How can we identify which one is good and which one is in bad quality? We should take the product shell apart to see what kind of electronic component they used inside. In this way, we can understand the reasons why the suppliers always say that the price they offered is the best price and couldn’t be low, while another supplier can casually offer you a price cheaper 5USD, or 10USD. On our last post: How to Identify Genuine PHILIPS G7 or Fake PHILIPS G7 LED Headl...

Do you like ? 179

Read more

How to Identify Genuine PHILIPS G7 or Fake PHILIPS G7 LED Headlight Conversion Kit?

Dear Our Esteem Clients, Recently we found that there is a counterfeit G7 PHILIPS LED headlight sold in the market. Whatever on appearance or packaging, they just totally copy our G7 LED headlight without any creation. We can not allow this happened and have requested our lawyer to suit this company. In order to avoid the situation that our esteem clients buy the fake products and cause any loss. We write this article to teach you how to identify a genuine G7 led headlight and the fake one. There are many detail difference between these two headlight bulbs: - Different Gloss - ACL mark - Craft and Detail - Cutting Curvature - Surface Craft - Thickness of Chuck - Solid metal and hollow metal on the connector - The width of the hanger - The surface craft of driver - LEDO G7 has scale mark - Counterfeit one has obviously cut burr - G7 Ledo use high hardness plug same to PHILIPS X-treme Ultinon led headlight - Different plug shape The craft details and electric component ar...

Do you like ? 273

Read more