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BenQ BlueCore Light Engine: a Smarter Alternative to Traditional Lamp The BenQ LW61ST is the first in the world to be equipped BlueCore, a light engine that utilizes the unparalleled qualities of a laser light source to achieve optimized energy efficiency, Projectorection performance and readiness. It also incorporates the BlueCore-enhanced SmartEco™ Advanced technology to further reduce light source power consumption by up to 90% for a significantly lowered total cost of Projectorector maintenance and ownership. Free of mercury, the BenQ LW61ST is a safer, smarter and environmentally friendly choice for your school.