Rated at 1500 LED lumens, I was curious to measure the aaxa 4k1 mini projector. Most UHP lamp-based projectors and even laser phosphor projectors are measured off of a 9 point system and an average is taken over the image. As LED projectors have come on strong and look so vibrant, this old method has trouble quantifying how bright the LED light looks to your mind.
Enter the Helmholtz-Kohlrausch effect, which you could google and read up on if you would like to. In a nutshell, what it means is that they increased color saturation of the LED light source is makes the image appear brighter to your brain. It is a real effect and the increased saturation also allows you to have a larger image before the colors become washed out because they are so deeply saturated. Feel free to google the H-K effect if you want to read up.
In measuring the aaxa 4k1 mini projector I measured the following brightness levels on a pure white screen, with a 35” Height. The measurements were consistent with most LED projectors on the market. Even better than most that specify LED lumens. The Max brigthness was 720 lumens.
Eco was measured at 520 lumens. With that brightness I was very pleased with my 200" image. The colors were very saturated as you can see in all the images. It is amazing the differences the color saturation makes on our perception. In viewing this projector, I would have easily thought it was 2000 lumens by appearance. The image was bright. There was no lack of color.