This Amazingly Bright  LED Light Source projector is perfect from educational use. Don't let the Lumen output fool you... they are incredibly bright! So bright you won't believe it until you see it!
Its ultra-portable and fantastic for portable student centered collaboration. With Battery operation it can be used anywhere, and with auto keystone correction, its simple to use. 
Fast on time <5 seconds to full brightness and it even features USB Content playback.

The best part is the 30,000 hour lamp life, or 20 years when using it for 4 hours per day.