The PT-RW630WU projectors utilize a laser light source and filter-less design for many hours of continuous and maintenance-free operation. With no lamp to replace, these projectors maintain a much more stable light output over a much longer period of time. Projectors with lamps to replace will go through more frequent cycles of brightness and dimming while the laser technology will remain steady and brilliant during the same period. The laser light engine combines unique technology to produce spectacular image quality in not only the primary but also in the secondary colors delivering an incredible contrast ratio with near pure white which some competitors struggle to achieve. Panasonic technology appears brighter than a traditional lamp-based projector with the PT-RW630WU. These projectors also feature an array of professional features for applications where features such as edge blending, pixel mapping, horizontal/vertical/360degrees rotational mounting and geometry control are required. Panasonic PT-RW630 DLP Projector - 720p - HDTV - 16:10 is one of many available through Office Depot. Made by Panasonic.