800 watt AM700X Graph-X Universal Photoprinting Lamp. Particularly suited to the fields of photo-printing, graphic arts, photo-resists, diazo photopolymer reproduction and other materis. The stippled front lens acts as a most effective spreader, homogenising the light and giving an elliptical beam distribution measuring approximately 24″ x 36″ at a distance of 2/3 feet infront of the lamp. 91-9831 sealed beam. GE MBI 800/U GRAPH X. GRAPHX MBI 400-800/U/SB 91-9831. Also known as part Number; 307-0310.