| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal halide discharge lamp and a metal halide discharge lamp system lighting the same suitable for direct-current lighting with color temperature difference between electrodes within the tolerance range. SOLUTION: The metal halide discharge lamp MHL is provided with a fire-resistant, translucent airtight vessel 1, a pair of electrodes 2A, 2B and a discharge medium with halide and rare gas sealed in without mercury substantially sealed in. If, when the lamp is lit in a single direction where a direction of current flowing in the airtight vessel does not change with time, correlated color temperature within 1/8 of a distance between the electrodes from a tip of one of the electrodes is T<SB>A</SB>(K), and a correlated color temperature within the range of 1/8 of a distance between the electrodes from a tip of the other electrode is T<SB>B</SB>(K), (provided, T<SB>A</SB>>T<SB>B</SB>), an inter-electrode correlated color temperature T<SB>A</SB>-T<SB>B</SB>is to satisfy: T<SB>A</SB>-T<SB>B</SB>≤3,000. COPYRIGHT: (C)2007,JPO&INPIT |
