Abstract
For the purpose of developing a high output light source with a high luminous efficiency, a metal halide lamp, containing sodium and thallium iodide of input power from 22 kW to 60 kW with a water-cooled outer jacket, has been investigated. A remarkably high luminous efficiency up to 126 Im/W and an average life of over 6000 hours has been confirmed after countermeasuring the major problems, such as the devitrification of the high loaded quartz and the arc voltage rise during life. A number of these lamps have been practically used for producing caprolactum by photonitrozation of cyclohexane.
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