METAL HALIDE LAMP FOR RAISING AND ENJOYING WATER GRASS

摘要

PROBLEM TO BE SOLVED: To provide a metal halide lamp of low wattage usable for both raising and enjoying a water grass in common, and formed to contain luminescence necessary for the photosynthesis of the water grass including almost all types of seaweeds, and have a color rendering evaluation number Ra equal to or above 80. ;SOLUTION: A light emitting tube 1 of 0.6cc content volume having electrodes sealed to both ends, and containing 1.6mg of dysprosium iodide, neodymium iodide and cesium iodide respectively sealed to a ratio of 2:1:2, 7mg of mercury, and 1.33×10⁴Pa of argon gas, and a protection sleeve 2 arranged outside the light emitting tube 1 are built into an outer tube 5, thereby forming a lamp. Then, the lamp is vertically laid to form a metal halide lamp 11 usable for raising and enjoying a water grass, so as to have radiation energy equal to or 35% at wavelength between 380nm and 495nm among radiation energy in a visible zone, radiation energy equal to or above 30% at wavelength between 600nm and 780nm, and Ra equal to or above 80.;COPYRIGHT: (C)1997,JPO