Metal halide lamp containing ScI.sub.3 with added cadmium or zin

Details Metal halide lamp containing ScI.sub.3 with added cadmium or zin Metal halide lamp containing ScI.sub.3 with added cadmium or zin

1981-03-30

1983-06-07

Demeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having specified electrode spacing

313634, 313642, H01J 6120, H01J 6122, H01J 6130

Patent

active

043873197

ABSTRACT:
A high intensity metal halide discharge lamp has a fill comprising mercury, sodium iodide and scandium triiodide plus an inert starting gas. Cadmium or zinc may be added in a molar ratio relative to ScI.sub.3 within the range of 0.04 to 1.0 to achieve a lowering in color temperature of several hundred degrees Kelvin at the cost of a minor decrease in lumens which is offset by an improvement in maintenance.

REFERENCES:
patent: 3398312 (1968-08-01), Edris et al.
patent: 3959682 (1976-05-01), Wesselink et al.
patent: 4161672 (1979-07-01), Cap et al.
patent: 4171498 (1979-10-01), Fromm et al.
patent: 4199701 (1980-04-01), Bhattacharya
patent: 4245175 (1981-01-01), McAllister

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