How much brightness is good enough for projectors? The Difference between Projector Lumens and ANSI Lumens?

Many consumers are confused about the brightness parameters of the projector when purchasing a projector. Perhaps in the eyes of laymen, evaluating the brightness of a projector can only be judged by the value. And as people gradually increase their expectations for high brightness and high resolution, many manufacturers will choose to use the concept of stealth to change the parameters in order to attract attention.
However, in fact, there is not an absolute positive relationship between the effect shown on the screen and the number of lumens marked. Not a projector with a higher lumen is better. So what exactly does a projector lumen do? Let's take a look at the mystery of lumens and learn to say no to false parameters.
Generally speaking, the lumen of a projector is divided into several units. There are only two of them in our daily life, one is the brightness of the light source, and the other is ANSI lumens.
The brightness of the light source refers to the "most original light-emitting brightness level" provided by the laser, light bulb, and LED light in the projector. In simple terms, the brightness of the light source is the brightness that has not been cut by the lens or other factors.

Another type, ANSI lumens is the international standard unit of projector lumens recognized by the world.
ANSI lumens is the brightness after layer after layer of reduction. Use the sun as a metaphor. The sun itself is the brightness of the light source, and the sunlight shining on us is the brightness that the projector projects on the wall after being cut. The brightness projected onto the wall is ANSI lumens.
According to relevant calculations, the light source brightness of 3500 is approximately equal to 1000-1200 ANSI lumens. Therefore, be sure to look for ANSI lumens when choosing a projector.
There may be consumers wondering what is the relationship between the level of lumens and the size and clarity of the picture?
As the brightness of the projector (lumens is the unit of brightness) increases, the picture projected at the same screen size will become brighter. So it looks clearer, but the resolution does not change; the increase in lumen has nothing to do with the screen size, but the brightness will change as the screen size changes. For example, the screen size is larger and the brightness is lower.
According to the size of the indoor space, in the space of 15-30 square meters, 100-800 ANSI lumens is recommended. In the space of 35-50㎡, it is recommended to be between 1500-2000 ANSI lumens. In the space of 60-100㎡, it is recommended to be between 3000-4000 ANSI lumens. In the space of 120-200 square meters, 4000 ANSI lumens or more is recommended. The two are well understood, because the lumen is proportional to the area of the house.