1. In addition to condensing light, the lens with a lens has another characteristic, that is, the light source is very evenly distributed, and the light is not strong in some places and weak in some places. The light of a car without a lens is scattered, and the light source is not easy to control.

2. Whether the headlight of a car has a lens is actually determined from the moment the car leaves the factory. Generally speaking, the low beam has a lens, and the high beam does not have a lens.

4. The high beam generally does not have a lens, because the high beam does not need to be tangent, and there is no need to cut off the excess light.

The light system with lens is called "projection system". A light system with a reflective bowl is called a "reflective system". Effectively speaking, the efficiency of the reflective system is higher than that of the projection system. In other words, when the brightness of the bulb is the same, the brightness obtained by using the reflector is higher than that by using the lens. For example, the above picture is a reflective lamp group, the reflective bowl is very close to the lamp beads, and the light is almost completely reflected without waste. There is very little light loss.

The difference between the advantages of three kinds of car lights

The halogen lamp solves the lighting problem of driving at night. Because of its low luminous efficiency, fast attenuation, and dim light, the driver is prone to visual fatigue. Another headache is that the halogen lamp is easy to use after a long time. Yellowing, resulting in low lighting efficiency.

LED lights, used in car lights, have high brightness, low power, and durability comparison: the current of the old halogen bulb is 4.21A, the current of the LED headlight is 2.24A, and the current of the halogen bulb is about twice that of the LED; the brightness of the LED headlight is about The brightness of the halogen lamp of the original car is more than 4 times.

Xenon lamp, the principle of light emission of xenon headlamps is arc high-pressure discharge, the light produced, this kind of light has high brightness, the color temperature reaches 6500K, the white light is blue, which is cold white light, when it shines on the road, it is like the sun at noon. It feels very comfortable!

3, the brightness of the LED headlights is more than 4 times that of the original car halogen bulbs;

4. Contrast effect: LED headlights without lens are much better than halogen headlights with lens, but the premise is that the low beam of LED headlights has a light-type tangent function.