Abstract: A metal halide lamp for producing high-intensity ultraviolet radiation contains an inert gas and a filler. The filler includes iodine and/or bromine in an overall concentration of from about 0.030-1.110 mg/cm.sup.3, mercury in a concentration of from about 0.318-5.250 mg/cm.sup.3, iron in a concentration of from about 0.005-0.036 mg/cm.sup.3, molybdenum in a concentration of from about 0.006-0.120 mg/cm.sup.3, and optionally, cobalt in a concentration of from about 0.0045-0.036 mg/cm.sup.3. The molybdenum is preferably introduced in the form of metal powder. The iodine and/or bromine is preferably introduced in the form of the corresponding mercury halides.