Projection science: What is the meaning of projector ANSI lumens/brightness?

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1. What does ANSI lumens mean

Simply put: ANSI lumens, developed by the American national standards institute (ANSI), use ANSI lumens to represent the light output of the projector, has been more generally accepted in the international community.

Professional explanation:

ANSI lumen refers to the main technical index of the projector. "light out" is usually represented by the light flux, which is the ability to describe the intensity of the visual response generated by the radiation of the light source within a unit of time. The unit is lumen.

The international standard unit of light flux for projectors is ANSI lumens, a method developed by the American national institute for standardization to measure the light flux of projectors. At present, it has been generally accepted internationally.

Understanding ANSI Lumens


2. What does brightness mean

Say simply: it is the light that projector light machine gives off.

Professional explanation:

Brightness is the index that defines the brightness of the image of the projector. In fact, it is determined by the light output of the projector. But at present the world each manufacturer does not have unified standard to this, accordingly in each specification respectively have brightness, illuminance, light output and so on different name, its unit is also a lot of, include lux, lumens, peak white lumens, ANSI lumens and so on. In fact, in optical theory, there are strict definitions and units for the physical quantity that represents the degree of light and shade of an object, but in daily use, people often confuse it with brightness.
 
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