Abstract: A projection unit for use within a slide or film projector or a microfilm viewer. The unit comprises a U-shaped metallic holder, a socket attached to or forming part of the holder's rear upstanding segment, a glass reflector secured to the holder's front segment such that its forward opening aligns with an aperture in the front segment, a tungsten-halogen lamp removably located within the socket and not engaging any of the interior surfaces of the reflector, and an ejector (metal arm member) for engaging the sealed end of the lamp and ejecting it out through the glass reflector's forward opening. Replacement of the lamp is thus possible without replacing the glass reflector.

Abstract: A tungsten-halogen lamp having a tubular envelope of quartz or high silica glass has a press-seal at one end which is reduced in width by the removal of right-angled sections from opposite lower corners of the press. The lamp further includes a ceramic base having a slot with closed ends for accommodating the reduced width portion of the press-seal.