Low-pressure mercury vapour discharge lamp.

摘要

A low-pressure mercury vapour discharge lamp comprising an electrode (6), first and second lead-in conductors (7,8) connected to respective ends of the electrode (6) and a metallic guard (9) partially surrounding the electrode (6) and supported by a conductive guard support (10). A bimetal strip (11) arranged for electrically connecting a lead-in conductor (8) with the guard (9) or guard support (10) upon heating by the discharge arc maintains the electrode (6) and the guard (9) at the same electrical potential during lamp operation to reduce the anode fall and the lamp power dissipation. <IMAGE>