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Street lighting light source selection

The light source for road lighting selection criteria, should first meet the road grade contrast (or brightness) requirements, then to meet the high luminous efficiency, long life etc.. Ordinary roads or squares, no need to consider the color index and color temperature.

Selection of electric light source from the angle of light effect, the order is: low pressure sodium lamp, high pressure sodium lamp, high pressure mercury lamp, self ballasted high-pressure mercury lamp, incandescent lamp. Selection of electric light source from the angle of life, the order is: high pressure mercury lamp, high pressure sodium (HPS, external trigger and trigger high-pressure sodium lamp), low pressure sodium lamp, self ballasted high-pressure mercury lamp, incandescent lamp.

Gas discharge lamps are of the highest light effect of low pressure sodium lamp, the light effect was 150 lm/W, while only 50 of lm/W high pressure sodium lamp, high pressure sodium lamp 100 lm/W. Thus, as in the use of low pressure sodium lamp instead of high pressure mercury lamp can save electricity by 66%. Application of low pressure sodium lamps, generally should be used in a suburban road, such as ND18 bulb can be made arbitrarily to ignite, and combined with the impedance type ballast, the average life expectancy for use in Beijing has reached more than 4000H, to replace the large-scale use of incandescent bulbs, is promising.

Self ballasted high-pressure mercury lamp for short life, light efficiency is low, not suitable for road lighting light source, should be strictly limited production and used in various occasions.