Today, Philadelphia city lighting has been the use of high-pressure sodium lamp.
The overall planning of urban lighting began in 1960, when Mercury was used as a light source for urban lighting. However, since 1970, energy issues have become increasingly prominent, had to re adjust the street lighting and road lighting planning. At that time in the eastern United States, the price of up to 15 cents / degree, equivalent to the United States on the West Coast electricity price of two times.
In such a grim situation, high luminous efficiency of high pressure sodium lamp came into being. Overall, replace the 400 Watt mercury lamp with a high pressure sodium lamp of 360 watts. In terms of luminous efficiency, a 270 Watt High pressure sodium lamp ensures the brightness of a 400 Watt mercury lamp.
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