Abstract: A shielded lamp unit for use in applications where a standard quartz lamp is susceptible to damage by contaminants. The unit includes a transparent substantially tubular sheath member having caps at opposite ends for supporting the lamp in a concentrically spaced relationship to the inner walls of the sheath and for sealing contaminants out of the lamp area. The end caps include a longitudinal bore which receives the quartz-type lamp and at least one concentric annular flange which is received in the inner bore of the tubular member.