MERCURYLESS SODIUM VAPOR HIGH-PRESSURE LAMP Russian patent published in 1994 - IPC

FIELD: production of ecologically pure (without mercury) light sources. SUBSTANCE: mercuryless sodium vapor high-pressure lamp is a discharge tube enclosed in an external bulb and filled with inert gas, sodium and additionally with zinc at the following relation of metals, percent by mass: sodium - 16 to 90 (50 to 80 preferably), zinc - 84 to 10 (50 to 20 preferably), the total amount of sodium and zinc is selected with-in mg/cm³ of the discharge tube internal volume, and the inert gas pressure - within 1 to 100 kPa. EFFECT: in the mercuryless version (ecologically pure) the above components of discharge tube filling provide for operation of the offered lamp in standard luminaires at a simultaneous increase of the service life, decrease of the firing potential and decrease of spread in electric parameters. 1 tbl, 1 dwg