PURPOSE: To provide a low pressure mercury discharge lamp with high output and long life, manufacturing method for the mercury discharge lamp, a low pressure mercury discharge lamp circuit capable of effectively applying the mercury discharge lamp, and an ultraviolet ray irradiation device. ;CONSTITUTION: In a low pressure mercury discharge lamp in which a discharge electrode 2 covered with a BaO-base emitter is sealed at each end or an arc tube which transmits ultraviolet rays, and Hg and noble gas are sealed, then the lamp is lit at a lamp current of 5-10A, the amount of the Bad-base emitter Dmg is set, when lamp current is 1A, as 10×1A+10≤D≤120. The low pressure mercury discharge lamp is manufactured in such a way that a discharge electrode covered with a BaCO3-base emitter material is sealed at each end of an arc tube which transmits ultraviolet rays, and the emitter material is activated. The amount of the BaCO3-base emitter material applied to the discharge electrode D'mg is set, when lamp current IA, as 10×1A+20≤D≤150.;COPYRIGHT: (C)1995,JPO
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