... High voltage sodium lamp 1,High effective energy saving; 2,High luminous effciency; 3,Long lifetime, low maintenance cost. High voltage sodium lamp Features of high pressure sodium hps lamp ... hoursCost-effectiveness of power consumptionGolden-color light output, strong fog penetrating capacity (helpful ... area requesting strong fog penetrating capacityHigh Pressure Sodium Lamps Available in 250W, 400W, ...