How to Wire a High-Pressure Sodium Ballast | It Still Works High-pressure sodium ballast lamps use high pressures of sodium, in an excited state, to generate light. A ballast, in series with an AC current voltage source, supplies the lamp with a near-constant stream of current. Sodium ballast lamps are widely used in 1000 Watt High Pressure Sodium Ballast - lighting-spot High-pressure sodium lamps are quite efficient — about 100 lumens per watt, when measured for photopic lighting conditions. Some higher-power lamps (e.g. 600 watt) have efficiencies of about 150 lumens per watt. Since the high-pressure sodium arc is extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide.
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