Manufacturers description for CASIO XJ-A255-VEJ PROJECTOR Never change a mercury lamp again with this Eco Friendly, Bright, Lightweight & the Thinnest High Brightness Projector in the Industry at 1.7 inches thick! The Casio XJ-A255V Green Slim Projector incorporates a patent-pending Hybrid Light Source that combines Laser & LED technology for amazing brightness that lasts up to 20, 000 hours, almost 10 times as long as a traditional mercury lamp. Green Slim technology also saves your valuable time. No more changing lamps. & no more waiting.