Low-pressure mercury vapour discharge lamp

Details Low-pressure mercury vapour discharge lamp Low-pressure mercury vapour discharge lamp

H - Electricity

01

J

313/81

H01J 1/62 (2006.01) C09K 11/77 (2006.01) H01J 61/44 (2006.01) H01J 63/04 (2006.01)

Patent

CA 1081306

ABSTRACT : Low-pressure mercury vapour discharge lamp having a colour rendering index Ra of at least 80, having a luminescent layer which emits in the three wavelength ranges from 430 ro 490 nm, from 520 to 565 nm and from 590 to 630 nm, the emission in the range from 590 to 630 nm being mainly derived from a rare earth metal oxide which is activated by trivalent europium. The luminescent coating comprises an oxysulphide of yttrium and/or lanthanum, activated by trivalent europium as an additional red- luminescing component, which oxysulphide constitutes from 2 to 10% by weight of the luminescent coating. -14-

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