Tungsten halogen incandescent lamp with arc preventing fill

Details Tungsten halogen incandescent lamp with arc preventing fill Tungsten halogen incandescent lamp with arc preventing fill

1986-06-02

1988-05-10

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Incandescent filament lamp

313569, 313637, H01K 150

Patent

active

047438029

ABSTRACT:
A tungsten halogen incandescent filament lamp is provided having a fill of inert gas and halogen. In such lamps and especially in lamps provided for studio and theatre applications having operating temperatures between 2200K and 3450K there is a tendency to arc over between the filament limbs. According to the invention this problem can be solved by adding hydrogen gas in an amount between 0.05% and 1% by pressure at 20.degree. C. This hydrogen gas is in addition to any hydrogen which is present as part of the halogen or halogens. A preferred halogen is the solid hydrogen, bromophosphonitrile (PN Br.sub.2).sub.n which introduces phosphorus as a getter into the lamp.

REFERENCES:
patent: 3912961 (1975-10-01), Rees et al.
patent: 4450381 (1984-05-01), Kendrick et al.

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