The Philips SOX lamp is a low-pressure sodium vapor lamp with a U-shaped discharge tube enclosed in clear outer glass. This Master SOX is a widely used sodium lamp in public lighting. It is characterized by its very high luminous flux. The color is orange/yellow light, monochromatic (in a very narrow light spectrum). Highest lumen/watt ratio of all gas discharge lamps.
Application . This SOX is used for illuminating streets, tunnels, parking lots, and other general public places where safety plays a role. Often wall or ceiling luminaires (flush or surface-mounted) and lampposts. The MASTER SOX lamps with a red BY22d base are used with an electronic ballast.
Lifespan of the MASTER SOX. Failure of 20% at 12,000 hours and 50% failure at 18,000 hours on electronic ballast. The light output at 25°C is 126-150 Lm/watt. This Master SOX lamp is NOT dimmable.
Available in color rendering 1700K (yellow orange) and in wattages of 35W, 55W, 90W, 135W, and 180W. Color rendering index (Ra) is 44. Burn position H110 (35 and 55W). 
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