Product Specifications

The H4 halogen bulb is a common type of automotive lighting bulb, widely used in the headlight systems of vehicles such as cars and motorcycles—especially as an integrated high-low beam bulb.

Compared with traditional incandescent bulbs, the H4 halogen bulb provides higher brightness, a longer service life, and better energy efficiency. It is one of the mainstays in modern automotive lighting systems, particularly suitable for applications that require multiple lighting modes (e.g., low beam and high beam).  

Typically, the H4 halogen bulb features a dual-tungsten-filament design, with each filament dedicated to either the high beam or low beam mode. The interior of the bulb is filled with halogen gas, which enhances the bulb’s brightness and durability.  

In terms of appearance, the H4 bulb has a transparent glass housing, inside which there are two tungsten filaments—one for high beam and the other for low beam. This design allows a single bulb to achieve two different lighting modes without the need for bulb replacement.