The PT-RZ475U is a laser light source 1-Chip DLP™ Full HD short-throw projector with 3,000 lumens level of brightness. It does not use a lamp, has efficient cooling system and uses DLP™ chip that has a long life, they are capable of 24/7 operation. The PT-RZ475U features 3,000 lumens of brightness. Rate of brightness deterioration in the LED/Laser-combined light source is extremely slow compared to lamp-based projectors. The SOLID SHINE drive uses a built-in sensor to constantly detect the light intensity of the light source and correct corresponding changes in white balance. This all helps to maintain excellent picture quality for a long period of time.