CERAMIC METAL HALIDE LAMP

摘要

The invention relates to a high-pressure discharge lamp (1) of the ceramic metal halide type having a molybdenum coil (50) wrapped around the ceramic discharge vessel (20) and at least a portion (32, 42) of the electrode feed through means, and having power ranges of about 150W to about 1000W. The discharge vessel (20) has a ceramic wall (22, 24, 25) and is closed by a ceramic plug (26, 27). An electrode (30, 40) which is located inside the discharge space (21) is connected to an electric conductor (12, 13) by way of a leadthrough element (32, 42). The leadthrough element (32, 42) projects through the ceramic plug (26, 27) with a close fit and is connected thereto in a gastight manner by way of a sealing ceramic (33, 43). The leadthrough element (32, 42) has a first part (34, 44) which is formed by a cermet at the area of the gastight connection. In addition, the lamps display one or more and most preferably all of the following properties: a CCT (correlated colur temperature) of about 3800 to about 4500K, a CRI (colur rendering index) of about 70 to about 95, a MPCD (mean perceptible colur difference) of about +/-10, and a luminous efficacy up to about 85-95 lumens/watt, a lumen maintenance of >80%, colur temperature shift <200K from 100 to 1000 hours, and lifetime of about 10,000 hours to about 25,000 hours. The invention also relates to design spaces for the design and construction of high power lamps.