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Posts Tagged ‘LED’

January 21, 2015

History of street lights in UK!

1766 First oil-powered street lamps installed in Paris. 1807 Gas lamps introduced to London. 1932 Introduction of low pressure sodium (SOX) lamp characterized by its dull, monochromatic yellow light. Although highly efficient, delivering 160 lm/W, the arc tube is very long. 1933 Introduction of high-pressure, mercury-vapor (MBF/U) lamps – the first high-intensity discharge (HID) luminaires. […]...

AUTHOR: Petra Vladykova Bednarova