PHILIPS single-tube metal halide lamps (HPM series) single-tube metal halide lamps (HPM): which added to the lead and gallium. Quality, performance and long lamp life, high radiation efficiency, good UV output, stable arc. The main emission diazo compounds, ultraviolet radiation (320 to 440nm) does not produce ozone. Mainly used in photographic materials copy of the non-silver film (diazonium salt film, sensitive adhesive) dry film solder mask, wet film, liquid photosensitive resist film, resin version, PS version, the exposure, the image from The transparent film is copied to the UV-sensitive carrier.