Luminescent screen for low pressure mercury discharge lamp with

Details Luminescent screen for low pressure mercury discharge lamp with Luminescent screen for low pressure mercury discharge lamp with

1998-12-09

2000-11-07

Patel, Vip

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313487, 313467, 313468, H01J 162

Patent

active

06144152&

ABSTRACT:
Color rendering indices Ra,8 between 80 and 90 and R9 greater than 20, and a color point on or near the Planckian curve, are achieved with a lamp vessel provided with a luminescent screen including a first luminescent substance which emits predominantly between 520 nm and 565 nm, a second luminescent substance which emits predominantly between 590 nm and 630 nm, and a third luminescent substance which emits predominantly in the range between 615 nm and 780 nm.

REFERENCES:
patent: 3937998 (1976-02-01), Verstegen et al.
patent: 4176294 (1979-11-01), Thornton
patent: 4267485 (1981-05-01), Murakami et al.
patent: 4800319 (1989-01-01), Kemenade et al.
patent: 5402036 (1995-03-01), Ito
patent: 5854533 (1998-12-01), Pappalardo

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