banner
Guangzhou LEDO Electronic Co.,Ltd > News > Tech Knowledge > 4 Simple Methods to Select the Best LED Headlight Bulbs

4 Simple Methods to Select the Best LED Headlight Bulbs

204 Published by admin 10 09,2018

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 Headlight Bulbs? - Three steps to test your new led headlight bulb, you will get the conclusion to this product.

How to Choose Led Headlight with Fan? - led headlight with fan has higher lumen output and smaller bulb size. But this kind of product has their weakness as well. How to make a choice?

Other Factors Related to the Quality of LED Headlight Bulbs - Except the features we mentioned above, what else will affect the quality of led headlight bulbs?

All-In-One LED Headlight vs. LED Headlight with an External Driver - All-In-One led headlight and led headlight with driver, which is better? Please allow me to explain to you.


Three Types of Led Headlight Heat Sink

 

Vehicle headlights are one of the most important components on car, HID bulbs and halogen bulbs are used on most of vehicles on road. In recent years, led headlight is becoming another choice for us to upgrade the headlight. There are so many different led headlights available on the market, how to make a choice, which is often confusing.

LED headlight bulb basically can be divided into three types according to cooling method.

 

Fanless led headlight with Aluminum heat sink.

 

Introduce:
The heat sink is made from alloy Aluminum, cooling by thermal radiation of Aluminum itself.

 

Pro:

The cooling capacity is very stable.

 

Con:

The volume of heat sink determines the heat dissipation capacity.

 

select the best led headlight bulb

 

Fanless led headlight with Copper Braid heat sink.

 

Introduce:
The copper braid heat sinks are made from red copper wire with tin coating on the surface. Aluminum finned heat sinks are made from 6063 alloy aluminum.

 

Pro:

The copper braid and wings are adjustable. They are all flexible and convenient for installation although in tiny space.

 

Cons:

- To install, we got to unfold the copper braid to maximized heat dissipation. And all wings cannot be squeezed together. Otherwise, the cooling performance will drop a lot.

- Bulb body and heat sink are connected by hydroforming process or fixed by screws. They are not 100% attached together, if there are only 50% surface attached, heat can only transfer from body to heat sink through 50% attached surface, just like the river narrows at the entrance and water flows slower, which will affect the efficiency of heat transfer.

 

 

LED Headlight with fan

 

Intro:

It relies on the fan to cool down the LEDs and bulb body.

 

Pro:

The cooling performance is the best compared the others above.

 

Cons:

- The fan quality is the vital factor to decide the lifespan of led headlight. When the fan is broken, the light output of led headlight will reduce a lot so that it cannot continue to be used.

- Fan will produce noise.

 

Select the best led headlight bulb

 

 

 

 

What Should We Concern on When Picking Fanless Led Headlight Bulbs?

 

Generally, we should look over a fanless bulb by four features,

 

Beam Pattern,Continuously

Flux (Lumen) Output,

The Working Temperature

The Volume of Led Headlight Bulb

The beam pattern is related to the Optical design and will decide the led headlight is street legal or not. Beam pattern won’t be changed once the Optics design is confirmed and the product mould is made.

 

But, the other three features have an interesting relationship and will be interacted. Bigger volume, better heat dissipation. Temperature rises, flux (lumen) output decreases. You can imagine LED headlight as laptop, and flux (lumen) output = processor speed; LED working temperature = CPU working temperature; the volume of led headlight bulb = the volume of laptop.

 

You couldn’t have a 13 inch Ultrabook laptop having top gaming performance; just like you couldn’t have a tiny led headlight bulb having the brightest flux (lumen) output. 15.6 inches laptop could have best gaming performance but it is heavy and not convenient to carry it with you, while big size led headlight absolutely have high flux (lumen) output but sometimes it don’t fit your car.

 

So choices must be made.

 

Select the best led headlight bulb

 

If you want it brighter, we can supply more forward current to reach the maximum relative light output of LEDs. So the led headlight could reach the maximum light output. But at the same time, LEDs will produce more heat and temperature will rise.

 

 

That means, we need to solve the cooling problem if increasing the brightness of led headlight.

 

If you want a better heat dissipation, we will need to increase the volume of the heat sink

 

There are the other methods to increase the heat dissipation capacity. Check them through this link.

 

 

 

How to Choose the Best Fanless Led Headlight Bulbs?

 

First, check the cooling performance capacity

 

It would be better if the working temperature of bulb body and heat sink could be closer. That means the heat transfer is good and high-efficient from LEDs to heat sink.

 

If the working temperature of bulb body and heat sink has big difference, it means the heat transfer from LEDs to heat sink is bad. Most of heat will still remain around LEDs and driver will decrease the forward current to LEDs for controlling the operating temperature and protecting the LEDs not from being over the Junction temperature. Then the flux (lumen) output will decrease a lot perhaps in 10 minutes after light-on.

 

We can check the working temperature of LED bulb by thermal imager. Here is the images of Blade led headlight.

 

Select the best led headlight bulb

 

(One thing should be mentioned that, whatever CSP led chips or Cree high power led chips, they all have a Junction Temperature(Tj). If LEDs keep working beyond the junction temperature, the lifespan will shorten a lot. For a longer lifespan as well as the safety, we need to keep the LEDs working under their Junction Temperature. To know the Junction Temperature (Tj) of a LED, you can download and check the data sheet of the LED chip from the LED manufacturer’s official website. Normally, the Junction Tmperature would be 155℃ - 160℃ if the LEDs are suitable for automotive application.)

 

Second, check the lumen output and beam pattern

 

The initial lumen value ≠ Ture Lumen Value. As working temperature goes up, the lumen output of LEDs will decrease. But their decrease levels are different. Here you should read the Lumen Test Report from supplier or test by yourself. A led headlight kit claimed 4000 lumen could be had 3500 lumen, 3000 lumen or 2500 lumen in 30 minutes after light-on.

 

Here is the flux (lm) data of Blade led headlight. (single led bulb in testing)

 

 

Third, check the light beam pattern

 

As we mentioned above, the beam pattern will decide if your led headlight bulb is street legal or not. A bad beam pattern will produce glare light and dazzle the oncoming traffic. For safety driving, we will suggest you to pick a led headlight with great Optical design and a standard beam pattern.

 

We can test the beam pattern in the garage. Here is the beam pattern of Blade led headlight. We test in 4 meters from the wall. And take the photo by SLR camera in setting ISO: 100, Shutter Speed: 10, Exposure: 10. Get the beam pattern image as below.

 

 

Through the above processes, we can almost judge whether a LED headlight is good or bad and select the best led headlight bulb by yourself.

 

 

 

 

 

How to Choose Led Headlight with Fan?

 

First,As I said above, the quality of fan will determine the lifespan of led headlight.

 

We will suggest you to choose the led headlight with ball-bearing fan instead of the one with sleeve bearing fan. The reason is the lubricating oil will gradually volatilize while the bearing works and temperature goes up, which result in the increase of friction and vibration. Then the noise of fan will increase dramatically and the lifespan will be greatly shortened. By comparison, ball-bearing can achieve less friction and much longer lifespan than sleeve bearing.

 

 

Second, Cooling system is based on aerodynamic or not?

 

In brief, we need air flow in and out efficient. The result is a high-effective and reliable cooling system. Some led headlights truly have poor air flow design.

 

 

Take the product on the right side of the picture as an example; it has a big cover to protect the fan from damaging or perhaps decrease some dust into the fan. But the cover will limited the amount of air supplied to the fan, which reduced the performance of the cooling system.

 

Third, check the lumen output

 

Same to fanless led headlights, The initial lumen value ≠ Ture Lumen Value.
You should read the Lumen Test Report from supplier, or test by yourself to record to lumen data continuously light-on it for more than 30 mins.

 

Here is the flux (lm) data of F2 led headlight. (single led bulb in testing)

 

 

Forth, check the light beam pattern

 

As we mentioned above, the beam pattern will decide if your led headlight bulb is street legal or not. A bad beam pattern will produce glare light and dazzle the oncoming traffic. For safety driving, we will suggest you to pick a led headlight with great Optical design and a standard beam pattern.

 

(Tested in 4 meters from the wall. And take the photo by SLR camera in setting ISO: 100, Shutter Speed: 10, Exposure: 10)

best led headlights

 

 

 

 

 

Other Factors Related to the Quality of LED Headlight Bulbs

 

- LED Chips

LED chips are the most expensive components of the entire LED headlights, especially while LED headlights using LEXEON ZES chips or Cree LED chips. The cost of LED chips is about 1/3 of the total price of the led headlight. So led headlights with ZES chips have higher prices than others. But the quality is guaranteed.

 

 

- SMT Process

The precision of the Surface Mount System, the quality of solder paste, they both decide the attached area and heat transfer capacity of led chips to PCB; and finally determine the defective rate.

 

 

- Other Electronic Components

The quality of other electronics components will affect the lifespan of led headlight as well. The branded and reliable components are necessary.

 

 

 

 

 

All-In-One LED Headlight vs. LED Headlight with an External Driver

 

We will notice that there are some all-in-one led headlights on the market; they look great and very convenient for installation. Are they an advanced design?

 

Here we should understand what all-in-one led headlight is. Does all-in-one led headlight have a driver? Yes, they have a driver, each led headlight has IC driver to turn on the led headlight and control the forward current. For the all-in-one led headlight, the developer just makes the driver integrated with the led bulb. A driver whatever internal or external, it must contain some electronic component including resistor, capacitance, inductance, and control IC, etc. When led headlight is on, these electronic components will begin to work and produce heat to reach around 80℃ as well. That means the cooling system of led headlight require to handle the heat from the LEDs as well as the extra heat from the driver. In this case, based on what we have learned above, we need to enlarge the volume of heat sink, or a higher rotating speed fan to deal with the additional heat. Or we can decrease the forward current as well as reduce the lumen output, in order to lower the total heat amount produced from LEDs and electronics component.

 

the best led headlights

 

So if there are two led headlights, one is all-in-one led headlight while another is a led headlight with an external driver, and their bulb size, cooling system, components are all same. The one with an external driver must be brighter and more stable than all-in-one led headlight.

Blade Led Headlight Test Report

This is Blade led headlight which was launched on May 2018. Its double beam led bulb was designed...

Do you like ? 124

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, ...

Do you like ? 82

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 fa...

Do you like ? 204

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...

Do you like ? 35

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 s...

Do you like ? 68

Read more

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

We are all looking for a led headlight bulb that could produce strong hotspot, a perfect distribu...

Do you like ? 326

Read more