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Abstract
To achieve higher luminous efficacy in metal halide lamps, it is desirable to reduce additive segregation. It was found that pressure and the kind of rare gases contained in metal halide lamps affected the lamp efficacy due to the change of the convection velocities and reduction in additive segregation. That effect was related to the axial variations of radiation intensities from additives in several examples. Convection velocities were calculated for various kinds of gases and pressures in 1000 W Sc-Na halide lamps.