The Optoma HD28B standard portable 3D DLP projector has 3800 Ansi lumens, a contrast of 30000:1 and a HDTV 1920 x 1080 resolution. The service life of the lamp is up to 10000 hours, which is over 13.7 years with a daily viewing time of 2 hours. A picture width of up to 626 cm is possible as the projector has 3800 Ansi lumens. The projector can create rooms with residual light with a smaller image width, we recommend a maximum of 417 cm. Furthermore, it is Full HD 1080P and 3D compatible and can even project Blu-rays onto the ceiling thanks to 360° projection. With only 28 decibels of operating noise, the model is already very quiet compared to others.