BenQ MX613ST, 2500 ANSI lumens, DLP, XGA (1024x768), 3000:1, 31 - 99 kHz, 23 - 120 Hz BenQ MX613ST. Projector brightness: 2500 ANSI lumens, Projection technology: DLP, Projector native resolution: XGA (1024x768). Light source type: Lamp, Service life of light source: 4000 h, Service life of light source (economic mode): 5000 h. Focal length range: 10.2 - 12.24 mm, Zoom ratio: 1.2:1, Digital zoom: 2x. Analog signal format system: NTSC, PAL, SECAM. Serial interface type: RS-232 The BenQ MX613ST short throw classroom projector is bright, has every connection you will need, and it is well suited for LAN environments. All in all, it is a potent package at a very reasonable price.... Short-throw projectors are terrific for eliminating shadows on images that interrupt presentations, but in many instances they fall short in terms of uniformity and clarity because of their complex lens design...