All ASX LED bulbs come with certified electromagnetic compatibility (EMC), which ensures they do not interfere with the vehicle’s electronic systems and are technically suitable for installation in 100% of the cars on the market.

However, optical compatibility—meaning the proper projection of the light beam in a headlight originally designed for halogen bulbs—can only be determined through a light beam test carried out in a workshop using a beam setter. This test verifies that the beam cut-off is sharp, correctly aligned, and does not produce dark spots that could compromise visibility or dazzle other drivers.

Although this test is not legally required, it is highly recommended for safety and responsibility purposes, both to ensure proper lighting and to comply with the requirements of the vehicle’s technical inspection (MOT).

As a general guideline, if your vehicle is from the year 2000 or newer and is equipped with projector, lens, or reflector-type headlights, there is a greater than 90% chance that the optics are compatible with an LED bulb.

You must enter all the required data in a form that you will find at the following link, once you have purchased the bulbs.
https://asxstore.com/pages/bulbs-led-approved

Here’s a more detailed explanation of how to do it:

Steps for Manufacturing Certificate

In order to drive and pass the technical inspection (ITV), your bulbs must carry the mandatory documentation certifying that they are homologated.

The certificate is individualized with your vehicle's data.

The data we will require in the form are:

• Make, model, and license plate of the vehicle.
• Vehicle homologation password: You can find this on your Technical Inspection Card, either in section “K” or in the text at the bottom left, following “… with the homologation password number of the vehicle: …” Enter all characters, including slashes and asterisks. (Example: e122007/362714*93)
• Type and model of bulb: Example: UltraLED H4
• Product serial number: The lot number. It is printed on the neck of the bulb. The number is printed on the bulb (it may contain 4 or 10 digits).
• Headlight homologation number: It is printed on the headlight itself, on the lens or on the inside part. It consists of an “E” followed by a number, enclosed in a circle. There should be one or two additional numbers, generally four digits each.

In compliance with Organic Law 10/1995, of November 23, the Penal Code, the company is not responsible for fraudulent use of the information or documentation provided, including the possible falsification of certificates. We warn that document manipulation is a criminal offense.

For any issues with your certificate, you can contact our Customer Service phone at +34 960 72 45 31, and we will try to resolve it as quickly as possible.

If you need a digital signature for your certificate: /Only in the Spanish market/

When you receive the email with the certificate, reply to the same email requesting the signature and include the purchase invoice.

We recommend that when passing the vehicle inspection (ITV), you bring the certificate along with the receipt or purchase invoice properly stapled. It is advisable to have it in PDF format.

Currently, the car's license plate is not a required element to be included in the certificate according to regulations. We request it only as an internal control measure, but at the moment, it is not a mandatory requirement for the certificate under current regulations.

This means that it does not need to be reflected in the certificate. The homologation and regulatory compliance of parts and accessories are based on other technical criteria and compatibility with the vehicle, so the license plate does not influence the certification process.

When you receive the email with the certificate, it is essential that you reply directly to that same email requesting the digital signature. Make sure to attach the corresponding purchase invoice, as it is a mandatory requirement for processing the certificate signature.

Additionally, we remind you that to pass the ITV, it is very important to present the signed certificate along with the purchase ticket or invoice. Both documents must be properly stapled, as this facilitates verification and meets the legal requirements for this process.

If you ever need assistance with your processing at an ITV center, feel free to contact us at +34 960 72 45 31, and we will provide the necessary advice.

It is important to check your vehicle's owner's manual . You can also consult a vehicle professional or an authorized service center.

* For example, if your car has H7 halogen, then H7 Led will fit.

https://asxstore.com/collections/bombillas-led-faro-delantero

Installing the bulbs is quite easy. First, you anchor the base of the bulb to the headlight and then you insert the bulb and orient it so that it produces the right beam of light.

Click on this link to view the installation manual.

https://asxstore.com/pages/manuales-y-catalogos

*There may be some headlights that need an adapter to mount the H7 model to the headlight.

If you don’t see an improvement in lighting after switching to LED bulbs, it could be due to several factors. First, it’s important to ensure that the bulbs are properly installed in the headlight, as incorrect placement can affect the direction and distribution of light. Additionally, some LED bulbs require a specific orientation to project light optimally, so it’s recommended to check that they are correctly aligned.

Another possible reason is wear on the headlight reflector. If the chrome coating on the internal parabola is deteriorated, the light will not be reflected efficiently, reducing the perceived brightness. It’s also important to consider the compatibility with the vehicle’s electrical system, as some models require additional decoders or resistors for LED bulbs to function correctly.

If, after checking these points, the problem persists, it is best to consult a specialist in automotive lighting to find the best solution.

The only bulb models that need an adapter are the H7. For the others, the adapter is the same as the halogen bulb that the car has as standard.

Check this list to see if your car needs it:

Compatibility of adapters

*There might be some vehicle models that require an adapter and/or decoder for LED bulbs.. If so, it is recommended that a professional check your car's headlight to see which of the models we have on our website fits it, making an observation and comparing it with the images of our models.

There are models where, due to the trim level or because different headlight manufacturers exist, multiple adapter models may fit. To check if your vehicle needs an adapter, review these two options:

• If the H7 bulbs are secured directly to the headlight with metal clips (no adapter is needed).
• If, on the other hand, the bulb’s own connector acts as the mounting or fastening mechanism for the headlight, then you most likely need an adapter.

Adapters are only required for H7 LED bulbs; other types do not need them.

"The need to use a CANbus decoder is not linked to specific vehicle models, but rather depends on the vehicle's equipment.

The more control units it has, the more likely a decoder will be needed. It is an optional accessory, recommended only if a 'bulb out' warning appears on the onboard computer.

Our bulbs are compatible with up to 90% of vehicles. Check our decoder list

This occurs when the warning light "blows out" appears on the dashboard. The car may then stop sending power and the light will flicker or turn off.

This is because the car detects that there is lower consumption, and can interpret this as a blown light bulb.

It is solved with a decoder, which is a resistor so that together with the bulb there is more energy consumption and it is equal to the halogen ones.

It happens rarely, but it can happen.

Decoders

The ULTRA is more powerful than the SUPER and already comes with the heat sink fan and prevents CANbus failure by 90%.

· Ultra: 23 watts of power and 1725 Lumens

· Super: 13 watts of power and 1170 lumens

Regarding documentation, of course. In some centres they may ask you for a digital signature to “officialise” the document, which we will insert without any problem upon request at Customer Service.

Another issue is the lighting test. Before your inspection, you should always check that the bulbs are perfectly compatible and that they emit an appropriate beam of light without glare.

If you have any problems, you can contact us at +34 960 72 45 31 or by writing to the following email: comunicacion@asxstore.com

Although the bulb is blue, the light is 6000k white, cool white.

Halogen bulbs have a lifespan of up to 3,000 hours. Our bulbs have a longer lifespan because they are quartz, UV protected and anti-vibration, both the original yellow and super white bulbs.

ASX LEDs use the 3570 CSP chip, a more modern chip that can deliver more lumens/watt than a standard CSP chip.

All ASX products have a 2-year warranty, ISO, INMETRO and E-MARK quality certification, and if the products under warranty are not repaired, they are exchanged for a new one.