What does a combined high/low beam headlight mean?

[HoldenLee]

Combined high/low beam headlights refer to a single bulb that contains both high beam and low beam functions, with two filaments inside the bulb allowing for instant switching. The working principle of combined headlights is as follows: one set of light beams is reflected directly forward by the lamp reflector, known as the high beam; the other set is a deflected beam, where the light is blocked by a shade to the upper part of the lamp reflector, resulting in downward-diffused light directed at the ground without causing glare to oncoming drivers, known as the low beam. Features of combined high/low beam headlights: 1. Energy-saving with a long lifespan; 2. Enhanced brightness of road signs and indicators; 3. Clear visibility in hazy weather; 4. Prevention of filament breakage and burnout; 5. Minimal radiation production.