Shrouded arc discharge lamp suitable for downlighting applications

Abstract

A low-wattage, high intensity arc discharge electric lamp () has a thick-walled outer envelope () extending along a longitudinal axis () and has a bulbous portion () and a narrow, cylindrical base () including oppositely disposed grooves () extending parallel to the longitudinal axis (). An electrically conductive mounting member () has grippers () formed on ends () thereof to engage the grooves (). The electrically conductive member () has a center portion () with a U-shaped segment () that is positioned within the base. An arc tube assembly () comprises an arc tube () having axially extending electrode lead-ins () sealed within a shroud (). The shroud () has parallel electrical connections () extending therefrom. A first of the electrical connections () is electrically and mechanically fixed to the U-shaped segment () of the electrically conductive mounting member () and a second of the electrical connections () is electrically insulated from the mounting member () by an insulator (). A threaded shell () is fixed to the base (), the shell () having a first electrical contact () electrically connected to the electrically conductive mounting member () and a second electrical contact () electrically connected to the second of the electrical connections ().