Abstract
New, stannous halide-mercury lamps have been developed based on a new principle. Continuous spectrum caused by the molecular emission of stannous bromide and stannous iodide is used in the discharge tube, and it constisutes more than 80per cent of the light output. The CIE general color rendering index Ra of the lamp is 94, which is comparable with the value for super de luxe fluorescent Iamps. The color temperature is 5300°K±200°K and the chromaticity lies on the Iocus of natural daylight. The efficiency is about 55lm/W for the lamp rated 400W. Lamps rated 250W and 125W are also available.
Another characteristic feature of the lamp is small fluctuation of light output with a. c. operation. The flicker ratio (Imax-min) / (Imax+Imin) of the Tamp is 18%, Which is about one fourth as compared with the conventional mercury lamps.
