| 摘要 |
The inclusion of an alkali metal halide in the gas fill of a high pressure mercury and aluminium halide discharge lamp improves the colour appearance of the lamp; notably by lowering the colour temperature, while maintaining or even increasing the efficacy and stability of the discharge. Preferred contents are 10 to 30 mg cm<->3 mercury, 5 to 100 mu mol cm<->3 aluminium halide and 0.5 to 150 mu mol cm<->3 alkali metal halide, with the molar ratio of alkali metal halide to aluminium halide in the range 0.1 to 1.5 and the total number of aluminium and alkali metal atoms preferably greater than the total number of halogen atoms. |
