Great quality at a great price! V7 Projector Lamp replacements are held to the most rigorous quality standards in the industry - meeting, and in some cases exceeding, the original manufacturers' performance requirements.High Quality: V7 quality is second to none. The V7 projector lamps benefit from partner patents, decades of research, design and manufacturing experience in using only the best components, testing every lamp to ensure Optimal quality and performance before each lamp is shipped.Brightest and Sharpest Picture: A projector brightness relies heavily on its lamp and is a key buying factor. V7 projector lamps put out enough light for normal business or classroom situations while some of the competitor lamps provide a washed-out image in large conference rooms and classrooms. Sharpness is another critical factor in selecting a V7 lamp where projecting graphics and video images must be sharp.V7 understands quality and reliability are factors to consider in purchasing a lamp replacement. Compatibility: ViewSonic PJ551D DLP ProjectorSanyo PDG-DSU20 DLP Projector VPL1784-1N