There is no symbol for dipped headlights. Below is relevant information about the classification of headlights: 1. Semi-sealed headlights: The lens and reflector of semi-sealed headlights are glued together and cannot be disassembled. The bulb can be installed from the rear of the reflector. The advantage of semi-sealed headlights is that only the bulb needs to be replaced when the filament burns out, while the disadvantage is poor sealing. Combined headlights integrate the front turn signal, front position light, high beam, and dipped beam into a single unit. The reflector and lens are made from organic materials as a single piece, allowing the bulb to be easily installed from the rear. With combined headlights, automobile manufacturers can produce headlight lenses in any desired style to improve aerodynamic characteristics, fuel economy, and vehicle styling. 2. Sealed headlights: Sealed headlights are further divided into standard sealed headlights and halogen sealed headlights. The optical system of standard sealed headlights involves welding the reflector and lens into a single unit to form the bulb housing, with the filament soldered onto the reflector base. The reflector's surface is vacuum-coated with aluminum, and the bulb is filled with inert gas and halogen. This structure offers excellent sealing, preventing atmospheric contamination of the reflector, high reflection efficiency, and a long service life. However, if the filament burns out, the entire headlight assembly must be replaced, which is more costly.
