Set of 2 bulbs H21W, 12V, 21W, BAY9S, 03357 Amio

The H21W bulb is a type of bulb with a BAY9s socket and has a power of 21 watts. This type of bulb is often used in the automotive industry for various applications. Here are some of the common uses of the H21W bulb in the automotive industry:

Side marker light (can be used as a turn signal bulb): In many vehicles, the H21W bulb can be used to provide a side marker light. This is the light that indicates the direction the vehicle is going.

Parking light: Some vehicles use the H21W bulb for the parking light, which is activated when the main headlights are not on, but reduced illumination of the area around the vehicle is desired.

Brake light: In certain applications, the H21W bulb can also be used to provide brake light when the driver presses the brake pedal.

Reversing light: In some vehicles, this type of bulb can be used to illuminate the area behind the vehicle when it is reversing.