Cut-off type lamps refer to lamps whose maximum light intensity direction and the downward vertical axis of the lamp are at an angle between 0° and 65°, and the maximum allowable light intensity at 90° and 80° angles are 10cd/1000lm and 30cd/1000lm respectively.

According to their light distribution, they are divided into three categories: cut-off type, semi-cut-off type, and non-cut-off type.

I. Distinction: Maximum light intensity direction: cut-off 0-65 degrees, semi-cut-off 0-75 degrees, non-cut-off -.

II. Definition:

① Due to the strict horizontal light, the lateral extension of light is suppressed, which makes the area around the road darker and almost no glare is felt. At the same time, a higher road surface, brightness and brightness uniformity can be obtained.

Full cut-off luminaire: A luminaire with the maximum light intensity direction of 0°~65°, and the maximum allowable light intensity at the 90° and 80° angles is 10cd/1000lm and 30cd/1000lm respectively.

②Semi-cut-off luminaire: The maximum light intensity direction is between 0° and 75°, and the maximum permissible light intensity at 90° and 80° is 50cd/100lm and 100cd/1000lm respectively.

③Non-cut-off luminaire: The maximum permissible light intensity at 90° is 1000cd. In short, the main difference is the angle of the light beam (not scattered light, etc.).