The lumen of a projector refers to the unit of its brightness. The higher the lumen value, the higher the brightness of the projector. 8000 lumens and 40000 lumens are two different brightness levels, and the difference between them is mainly reflected in the following aspects:

Brightness: 8000 lumen projectors are usually suitable for smaller meeting rooms or classrooms, while 40000 lumen projectors are suitable for larger meeting rooms, stadiums or performing arts venues. The projector with 40,000 lumens has higher brightness and can present clearer and brighter images on a larger projection area.

Resolution: Generally speaking, projectors with higher lumen values tend to have higher resolution. Therefore, a projector with 40,000 lumens usually has a higher resolution and can present a clearer and more delicate image.

Cost: A 40,000-lumen projector is usually more expensive than an 8000-lumen projector. This is because the projector with 40,000 lumens needs more light sources, with higher technical requirements and higher manufacturing costs.