The right bulbs for the car must fit into the socket, they should last long enough, be bright enough and at the same time must not dazzle too much? These are the basic attributes that should be enough for you to know which bulb to buy.

You can best find out the type of bulb in the car's owner's manual or after removing the defective bulb. For modern cars with separate lights for dipped and high beams, these will be single-filament H7 car bulb sockets, for simpler lights, double-filament H4 bulbs. This marking is shown on the box and on the socket of the car bulb.

The voltage and wattage of the bulb are important. Passenger cars must always have homologated bulbs for night and day lighting of 12 V and an input of 55 W. For trucks, the voltage is 24 V. You can find this information directly on the car bulb.

In smart cars, however, it is often not possible to replace a classic car bulb with an ice-cold one, because the car perceives an LED bulb, due to its low consumption, as a deffective one. CAN BUS marking can solve this problem. If the bulb has this mark, it means that modern cars will not report the LED bulb to you as a defective bulb, nor detect a low-energy LED car bulb, but the bulb will light normally.