1
what’s the use?
to provide close to the vehicle when driving at night illumination. A switch can be left by adjusting a knob or lever instrument panel behind the wheel.
2
Characteristics
low beam lamp light irradiation angle is low, the distance is short, a large irradiation range. Degree of convergence can not be adjusted. The main open road in good lighting conditions up car.
3
Category
The type of light source is divided into, halogen, xenon, LED , laser four.
halogen headlamps
is filled with a halogen element such as iodine, bromine, or tungsten halide lamp, tungsten halogen lamp or a halogen lamp is generally referred to. Advantages of simple structure, low cost, easy to control brightness. Halogen headlights but low emission efficiency, a light source is not easy aggregation.
xenon headlights
is also called HID gas-discharge headlights. Instead of the traditional tungsten wire is wrapped with a high-pressure xenon gas into the quartz tube, providing higher color temperature, more gathered lighting. But compared to higher costs halogen headlights, the gas inside the need to reach a certain temperature emit light, a certain degree of hysteresis.
LED largeLamp
with a LED (light emitting diode) as a light source of headlights. The advantage of high reliability, and long service life. Simple rugged, less susceptible to shock impact, fast response. But its high cost, high heat during lighting, easily damaged.
Laser headlights
In a laser diode as a light source of vehicle headlamp, the LED headlamps as laser headlights have fast response speed, brightness, low attenuation, low energy consumption, long life . But smaller compared to the LED headlights, higher luminous efficiency.