Projectors have been used in classes for long time as an indispensable educational tool to learn more efficiently and extensively. The technology used in projector before was based on normal light bulb, but now LED is being used. "Assumption University" in Bangkok is one of the leading universities in the study of natural environment. Most of the classrooms now use LED projectors manufactured by Casio. CASIO was the first manufacturer that developed mercury zero in all projectors. Casio's own projector evolved to "Laser and LED Hybrid light source" with excellent environmental and economic operability. In order to avoid the use of mercury and waste, CASIO continues to be the world's leading pioneer in the next generation of projectors. The use of LED technology makes the projector boot up faster as well. The technology that takes into consideration health and environment is expanding to contribute to people's life in the field of education.