interactive whiteboard ruler. 2.2 Due to the large light-emitting angle of the LED, the light-emitting angle relative to the laser light source is small, and the optical system can not collect more light energy to increase the brightness by increasing the number of LEDs, it will cause hybrid source with bad light collection efficiency, on account of this, it will reversely result in hybrid projector in high brightness mode must sacrifice color balance, if choose the color balance mode must sacrifice brightness, it will only 1500 lum.. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.