As a teacher, I am building the projector 2-3 times a day up and down and wear it accordingly from room to room. For high-contrast presentations (PowerPoint and Co, mind maps, etc.) even in normal daylight absolutely sufficient. Since then I have the device, I get more and more in order to virtual panel paintings, the panel remains unsoiled. To praise this is the low weight and the included carrying bag. The ultra-fast arrival and off in combination with a fixed HDMI connection for laptop do the rest. A proper darkening I need only for private viewing pleasure in Feierabend. Who only the latter intends to should certainly set a different model with a higher luminosity (but certainly higher weight).