Tungsten electrodes are used to make the electrical connection via a molybdenum foil seal, and this is terminated by a metal cap or ceramic base with wire leads.
Construction of a typical metal-halide lamp
Development
The metal halide lamp is a development of the medium pressure mercury arc lamp involving the addition of some rare earth metals and iodides to produce specific light output emissions. These lamps are widely used in the graphic arts, printing and surface coating industries and in industrial applications where photoinitiators are used. The manufacture of these metal halide lamps had traditionally been the province of large multi-national lighting companies, however Heraeus Amba Ltd has been manufacturing them since 1990, and their production facilities in the UK and Germany produce the most extensive range available on the market.
Manufacture
Heraeus Amba Ltd has a unique manufacturing system for metal halide lamps. Uniformity of production and a very low batch to batch variation factor is maintained as all the pumping and filling schedules are controlled by the microprocessor based systems. This consistent quality is further maintained by comprehensive inspection at all stages of manufacture, and every lamp is tested and inspected before leaving the factory.
Light Output
In all processes using a metal halide lamp, best results will be obtained if the lamp closely matches the requirements of the photo-chemical process. The examples here are typical options of metal halides for specific applications.
Gallium Iodide has the effect of introducing spectral lines at 403nm and 417nm of the electromagnetic spectrum. This is particularly useful with Diazo type processes.
Iron Iodide is a broad band emitter and enhances the spectral output of the lamp in the 380nm region. This can be used with good effect on photopolymer and daylight film exposure systems.
Multi-spectrum lamps can also be produced. These consist of two or more additives which improve performance across a range of different exposure products.
Further information:
Product range
Pre-Press Lamps
MH Module 250 W
Performance Guarantee
Contact Heraeus
