The lights should provide good lighting and should minimize glare. For the headlamps, in order to take into account the above two requirements, the use of high beam and near light two conditions. The long-distance light beam is used in the front without a car or a car that is not used in conjunction with other cars. The main filament is located at the focal point of the reflector, and the beam direction is approximately horizontal. Usually the maximum luminous intensity of a single lamp should be not less than 20,000 candela. In order to ensure the safety of driving, the distance of the light (the distance between discovery and identification of obstacles) should be greater than the braking distance to achieve timely parking. In view of the need for high light intensity is about proportional to the speed of the fourth power, most countries are the speed limit. In addition, in order to change the distance and near-light conditions, the driver will not be able to recognize the ability for a short time because of the variation of light and dark, thus stipulating that the total luminous intensity of all the headlamps should not exceed 225,000 candles. The near light is a close-range illumination beam used in a rendezvous or trailing other car, and is produced by a smaller power sub-filament. The beam is projected downward by deviating from the reflector focus and the optical axis. In order to limit the horizontal direction of the beam above the sub-filament is usually installed under the metal mask, so that the vertical screen to form a light and steep changes in the light shape, when the car, the driver's eyes in the near light , Thus maximizing the inhibition of glare.
Generally about 5000K color temperature is about white, and the lower the color temperature, the more warm color, the higher the more blue.
The color of the light is related to the color temperature.
Car white light is xenon lamp lighting; yellow light is tungsten bulb lighting, generally about 50W or so.
