High pressure metal halogen discharge lamp - has glass envelope with wall thickness defined by regulation in terms of lamp power

摘要

The discharge lamp has a lamp envelope (2) which is rotationally symmetrical and which is fitted to a quartz glass lamp shaft (3,4) at each end, receiving an electrode (5,6) via a gas-tight sealing foil (7,8). The lamp envelope (2) is filled with one or more metal halogenides and has an optimal wall thickness d, defined by d=1.5+0.1 cube root (P), where P is the power of the lamp in Watts. Pref. the difference in the actual wall thickness from the optimum wall thickness is less than plus or minus 0.2 times the optimal wall thickness, d. ADVANTAGE - Optimum lamp operating characteristics and compact size.