Sodium  

High pressure sodium light bulbs are a type of lighting called HID or high intensity discharge. Some other kinds of HID lighting are metal halide, mercury vapor and low pressure sodium. High pressure sodium lamps have generally a greater light output, golden white light (sometimes people say yellowish) and require special ballasts and fixtures for each specific lamp. High pressure sodium light bulbs are often used in industrial, security and roadway lighting because of their energy efficiency.

 

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