Click "FIND YOUR BULBS GUIDE", choose the bulb positions of your car model.

F16 PLUS series top seller with the strongest brightness, perfect beam pattern,  built-in decoder fit 98% car model compatible.

The easiest way, observe how many bulb positions on your car's headlamp assembly has?

Plug size 9005 9006 H11 9012 H7 H3 Should be single led chipsets bulbs, fit for low beam or high beam, fog light.
Plug size H4 9007 9004 H13 Should be twin led chipsets bulbs, high beam and low beam switching on one bulb.
Plug size chosen depended on your vehicle model.

No,LED is a mild and bright white light, the power and lumens will improve the viability at night without blinding oncoming traffic. No worries, please.

LED bulbs are characterized by low energy consumption and high brightness, the start current is much lower than the original halogen bulb. High-end vehicles are equipped with an advanced driving system, which will automatically detect the lamp current. When the current is lower than the normal value, the instrument panel will report headlamp failure.

If the vehicle warns you when a bulb is out, it is equipped with CAN Bus. The easiest way is to contact the vehicle’s supplier or dealership. If you’re still not sure, we normally tell customers to remove the light and drive the vehicle to see if it gives a warning. For example, remove a rear parking light – one that is not a brake light or turn signal also and drive the vehicle around during the day with the parking lights on. If the vehicle gives the bulb out a warning, it is CAN Bus. If no warning, no CAN Bus. Most European models and FORD models need to install extra Decoder if retrofit LED bulbs.

The driving system automatically detects that the headlamp current is lower than the normal value. If it thinks that the bulb is faulty, the control system will try to restart the headlamp and flicker. If the current still fails to reach the normal value after switching, the headlights may be turned off automatically. This is why the headlights do not light after modification.

The decoder can increase the current of the headlamp circuit through the electronic circuit, letting the system judge that the headlamp current is normal. The system normally does not report fault or flash or automatically turn off the car headlights.

Please connect +/- wires (the polarity) in the opposite locations and try? Confirm the prongs needed to be tighter. Please the lamp body with 12V power alone to check whether lights up?

H7 sockets for car models such as Hyundai, Kia, VW, BMW, BENZ, etc. It is needed to install a special chuck for better fixing when replacing the LED bulb.If you are unsure whether this product is compatible with your vehicle, just pop up the hood and compare this product with the stock headlamp socket.We provide the most versatile chuck types, please contact us for help.https://auxbeam.com/collections/led-light-bulbs-light-bulbs-accessory-base-holders

It may be heat dissipation. Please check whether the cooling fan is working normally and if there is enough space for the light to dissipate heat?

Generally, we do not recommend using led’s as DRL since the working voltage is different when switching to DRL, lights will dim or flash, can’t be compatible very well. Recommend you to purchase low-power LED special replacement bulbs for use as DRL.
https://auxbeam.com/collections/led-replacement-bulbs/LED-Replacement-Bulbs