Device for improving the efficiency of a low-pressure sodium vap

Details Device for improving the efficiency of a low-pressure sodium vap Device for improving the efficiency of a low-pressure sodium vap

1977-12-09

1978-09-05

Smith, Alfred E.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Shunt circuit closing

315127, 315158, 315159, 315208, H05B 3702, H05B 41392

Patent

active

041123310

ABSTRACT:
A low-pressure sodium vapor discharge lamp and a current stabilizing ballast element are connected in series to an energy source so that the lamp is operated by means of a non-sinusoidal current. The temperature of the wall of the discharge tube is maintained in an accurately defined interval and the instantaneous current density in the tube is kept below a first given value and the effective current density is kept above a second given value. This results in a relatively high luminous efficacy.

REFERENCES:
patent: 4001633 (1977-01-01), Van Tongeren et al.
Philips Technical Review, vol. 2, No. 12, Dec. 1937; pp. 353-360, by E. G. Dorgelo & P. J. Bouma.

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