This is an Elmo ENX 360 Watt/82 Volt, heavy duty Projector Lamp --
Flat bi-pin, ceramic base, built in MR-13 type mirror reflector
It is used in the Elmo HP-L355, L290, HP-L3550, L2900, HP-3K, 3KDX, HP-254S, HP-L14 Series, Kodak Ektagraphic 3, 1711, 1720, 1730, 1740, 1760, 1780, 1810, 1820, 1830, 1880, 1881, 9050, and other brands of projectors
For a Genereic Brand, Click Here.
For a 3M brand-specific version, Click Here.
For a G-E brand-specific version, Click Here.