HIGH-VOLTAGE DISCHARGE LAMP AND LIGHTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a superior a high-voltage discharge lamp and lighting device using it for an apparatus to magnify and project an image with little deterioration in light volume during its service life and which has a simple structure. SOLUTION: The high voltage discharge lamp is provided with a fireproof and translucent sealed container 1 with a discharging space 1a in the inside; a discharging medium sealed inside the discharging space 1a in the sealed container 1, provided with an electrode shaft 2a with a cross section S (mm2); a pair of electrodes 2 and 2 sealed inside the sealed container 1 and containing mercury, halogen and noble gas and in which the mercury vapor pressure, when lit, is at least≥10 MPa and when the lamp current in stable lighting is I (A), the inequality formula 6.5