H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/18 (2006.01) H01J 61/12 (2006.01)
Patent
CA 2315492
Mercury-free metal halide lamp with a warm white luminous colour, the fill of which comprises the following components: an inert gas which acts as a buffer gas; a first group of metal halides (MH), the boiling point of which is above 1000°C (preferably above 1150°C), the first group comprising at least Dy and Ca used simultaneously as metals, and the molar ratio of the two metal halides Ca-MH:Dy-MH being between 0.1 and 10; these are components with a low volatility which are present in saturated form; a second group of metal halides, the boiling point of which is below 1000°C (preferably below 900°C), the second group comprising at least one of the elements In, Zn, Hf, Zr as metals; these are volatile components which are mostly present in unsaturated form; the total fill quantity of the first group of metal halides being between 5 and 100 µmol/cm3; the total fill quantity of the second group of metal halides being between 1 and 50 µmol/cm3; and the colour temperature being between 2700 and 3500 K; the general colour rendering index being at least Ra = 90, while at the same time the red rendering index is at least R9 = 60.
Fetherstonhaugh & Co.
Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh
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