What are the cut-off lamps and half-cut lamps?

(Last Updated On: July 13, 2020)

According to its light distribution, bai is divided into three types: cut-off du type\semi-cut type\non-cut type lamps

Distinguish: Maximum light intensity direction: cut-off 0-65 degrees, half-cut 0-75 degrees, non-cutting.

Definition: Due to the strict horizontal light, the horizontal extension of light is suppressed, so that the surrounding area of the road is darkened, and almost no glare is felt. At the same time, a high road surface, brightness and brightness uniformity can be obtained.

led road street lighting

Full cut-off luminaire:

The maximum light intensity direction is from 0° to 65°, and the maximum allowable values of the light intensity in the angle direction of 90° and 80° are 10cd/1000lm and 30cd/1000lm respectively.

Semi-cut-off luminaire:

The maximum light intensity direction is between 0° and 75°, and the maximum allowable values of the light intensity in the angle direction of 90° and 80° are 50cd/100lm and 100cd/1000lm respectively.

Non-cut-off luminaire:

The maximum allowable value of the light intensity in the direction of 90° is 1000cd. In short, the main difference is the angle of the outgoing beam (not the scattered light, etc.).

The maximum allowable value of the light intensity emitted in the specified angle direction, the cut-off roadway lights exceed 90°, and the maximum non-cutting light can only reach 80°.

It is strictly prohibited to use non-cutting roadway lights on the main roads of expressways and Yingbin Road, main roads leading to government agencies and large public buildings, roads in the city center or commercial center, and large transportation hubs.


Non-cutting roadway lights shall not be used on secondary trunk roads, residential areas mainly for pedestrians and non-motor vehicles.

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