Viewsonic PROJECTOR PJ 551, 1500 ANSI lumens, 400:1, 30"- 300" (measured diagonally), 15 - 78 kHz, 56 - 120 Hz, LCD Viewsonic PROJECTOR PJ 551. Projector brightness: 1500 ANSI lumens, Contrast ratio (typical): 400:1, Screen size compatibility: 30"- 300" (measured diagonally). Display: LCD. Weight: 2,4 kg. Aspect ratio: 4:3, 16:9, Light source: Lamp 150W UHB Compact, 2,000 hour rating. Running eco-mode extends life beyond 2,000 hours if..., Dimensions (WxDxH): 289 x 210 x 84 mm