LOW-PRESSURE METAL VAPOUR DISCHARGE LAMP

摘要

The invention relates to a low-pressure metal vapor discharge lamp comprising a discharge tube and an outer bulb enveloping the discharge tube. Provided between the discharge tube and the outer bulb are a barium-containing getter and an electrical resistor which, in operation assumes a temperature of at least 500 DEG C., for cracking CH4 gas. According to the invention, the resistor is enveloped for the greater part by a ceramic tube, which prevents the electrons emitted by the hot resistor from being deposited on the exterior of the discharge tube wall.