The Panasonic PTL-LB355 is a bright projector suitable for business or education needs. There is no need to turn the lights off as your PT-LB355 is powerful enough to project clearly in light rooms due to the bright 3300 lumens. You will be able to project in a bright room to a medium sized audience with no problems at all. A high brightness and high contrast ratio have been achieved in a lightweight body for the PT-LB355.