Abstract
A very high optical performance can be achieved by enclosing a metal halide lamp, suitably doped for the printing and reprographics industry, in a sealed beam reflector and refractor enclosure. The period of exposure needed under this very actinic light source is considerably shorter than that required by pulsed xenon, mercury vapour or the carbon arc and its enclosed optics ensure an excellent u.v. maintenance throughout a long life. Designed to be used on a 240 V a.c. supply the lamp consumes 400 watts and operates with a choke ballast and starter unit.
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