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the lamp is on. The bright light may hurt your eyes. ·□ Warning- To reduce the risk of fire or electric shock, do not expose this projector to rain or Original lamp without housing. The original OPTOMA UHD50 lamp is a bare bulb from one of the OEM manufacturers (Osram P-VIP, Philips UHP, Ushio, Matsushita,UHD50 Specification ; Aspect Ratio, 16:9 (native), 4:3 and LBX compatible ; Offset, 100% ; Projection Screen Size, 34.1” - 302.4 (34.1” to 140” optimal image size).