The BenQ SP920 adopts a unique positioning of the lamps which alters the angles of light emission to generate an ultra brightness of 6000 lumens. This trademark lamp design of BenQ not only enables the SP920 to project the brightest light but also helps increase the efficiency of the lamps. So you can enjoy the best projection while benefiting from energy conservation. There are three projection modes to the BenQ SP920. The high brightness mode projects the brightest image even in an auditorium. The economy mode slightly reduces the projection brightness in order to decrease the wear on projector lamps which in turn ensures an interruption-free projection. The single lamp mode further minimizes the replacement of projector lamps.