One of the crucial features offered by the Epson EB-G5200W is its ability to provide up to 4200 Lumens via incredibly efficient ETORL (Epson Twin Optimised Reflection Lamp) technology. Designed to minimise light leakage a primary cause of lamp inefficiency and minimise light diffraction, ETORL lamps combine an ellipsoidal reflector, spherical lens and hemispherical mirror. This combination ensures optimum light efficiency with minimal power consumption and heat generation.