The most important parameter of projector is brightness, and the unit of brightness is lumen, followed by resolution.

Importance of brightness:

Brightness determines the size of the projection. The brighter the machine, the bigger the screen. Because of the high brightness, you can see the displayed content. But the bigger the lumen of the projector, the better.

Lumens are brightness. For schools, a small classroom of 15-30 square meters can accommodate a small number of students. Choose a business education projector with brightness of 1500 lumens, which is enough for school use. For a classroom of 30-60 square meters, you can choose 1500-2500 lumen brightness. For the school auditorium, you can choose projection equipment with more than 3500 lumens.

Extended data:

Household lumens:

The bigger the better, the smaller the better. The brightness of the projector determines the brightness of its bulb. If your room is dark, don't choose a projector with too high brightness. Because the brightness of the projector is too high, it will hurt your eyes for a long time. It's bad for your eyes.

So choose a projector according to the size and needs of your room.