PT-DZ21K2 Series projectors lower total cost of ownership (TCO) with an extended a lamp replacement cycle of up to 3,000 hours. Environmentally friendly design reduces power consumption to just 2,060 W. The quad-lamp system allows the projector to keep working even if a lamp should fail. Lamp Relay Mode alternates lamp operation to enable efficient and reliable 24/7 projection. Quad, Triple, Dual, and Single Lamp modes can also be used. A newly designed liquid cooling system directly cools the DLP™ chips to stabilize performance in temperatures of up to 45 °C (113 °F) while producing just 46 dB of noise.