What is mobility?

Lumen is the main technical index of projector, which is usually expressed by luminous flux.

Luminous flux is the ability to describe the intensity of visual response produced by light source radiation in unit time, and the unit is lumen, also called brightness.

The unit of projector luminous flux is ANSI lumens, which is the standard for measuring projector luminous flux formulated by American National Standardization Association. It measures the illuminance of each point at the nine intersections of the screen "sky", multiplies it by the area, and then finds the average of the nine points, which is the ANSI lumen of the projector.

The higher the lumen value, the brighter it is. The higher the brightness, the less need to turn off the lights when projecting.

ANSI stands for American National Standards Institute.