Ans: 31mm LED bulbs are commonly used for Japanese cars map or dome lights, 37mm LED bulbs are commonly used for European cars dome lights, or license plate lights and 42mm LED bulbs are commonly used for American cars map or dome lights.
Ans: For some newer European vehicles such as BMW, Mercedes, Audi, Volkswagen, etc, they all have a very smart and sensitive on board computer, OBC. The OBC will notice the LED bulbs because LED bulbs have lower wattage comparing with original fillament bulbs. In order to eliminate the flash problem and bypass the OBC error showing on the dashboard, you will need to add resistors. Or purchase our LED bulbs with built-in-resistor to prevent this issue.
Ans: Please try to rotate the bulb 180 degree and plug in again. Since the LED is polar sensitive, it means that of the power terminals are not matching correctly, the LED will not light up. (+ with + and - with -). But if the problem remains, please contact us.
Ans: We have a find my bulb function on the home page, which you can use to get the correct bulb fitment for your vehicle. If you are stil having a problem you can either email us at firstname.lastname@example.org or give us a call on 0208 257 3555
Ans: The LED bulbs have shaper lighting, therefore it will appear brighter than original tungsten bulbs. However since LED bulb has narrow angle, therefore if looking at the LED bulb from its blind angle, it will somehow look dimmer. Therefore we highly recommend when installing the LED bulb, make sure to point the LED clusters directly to the desire area.
Ans: If you want to exchange, please contact us and we are more than happy to exchange for you with no additional cost in most circumstances. However, it is customer's responsibility to pay for the returning postage. We do recommend that recorded delivery is used to track the items.