At present, domestic and international road lighting uses high-pressure sodium lamps as the main light source, accounting for more than 95% of the total number of street lamps. Other light sources are: metal halide lamps, ceramic metal halide lamps, LED lamps, electrodeless lamps and fluorescent lamps, etc. More than 100 million.
The operation of the high pressure sodium lamp is an arc discharge state, and the volt-ampere curve is a negative slope, that is, the bulb current rises while the bulb voltage drops. Under constant power conditions, in order to ensure stable operation of the lamp, a circuit component with positive resistance characteristics must be connected in series to balance the negative resistance characteristic and stabilize the operating current. This component is called a ballast or current limiter. At present, more than 99% of ballasts used with high-pressure sodium lamps are magnetic ballasts, and others are electronic ballasts.
At present, at home and abroad, the high-performance sodium lamp is driven by an inductor ballast. More than 60% of the domestic street lamps are not used to improve the power factor capacitor, which makes the power factor of the street lamp without capacitors about 40%. European and American countries have enacted laws and regulations from the beginning, forcing the power factor of all lamps to be no less than 80%. Therefore, adding a capacitor to the inductor ballast is a process that has been used in Europe, America and Japan for nearly a hundred years to improve the power of various lamps. Factor. The existing street lamp inductance ballast consumes a lot of power, a 250W sodium lamp, and its magnetic ballast itself consumes up to 50W.
In addition, some research results indicate that under the "intermediate vision" condition, the luminous flux utilization rate of the high-pressure sodium lamp is greatly reduced, that is, the effective light efficiency of the high-pressure sodium lamp is greatly reduced, and is lower than the effective light effect of the metal halide lamp.
The energy saving methods for high-pressure sodium lamp street lamps at home and abroad are as follows: to improve the power supply efficiency of the sodium lamp, and to install a capacitor in the existing magnetic ballast lamp to increase the power factor to 80~90%, which can not generate street lamps. Power saving effect; improve the sodium lamp power saving efficiency, that is, reduce the power consumption of the existing sodium lamp magnetic ballast; with the voltage fluctuation, the street lamp working efficiency remains stable; adjust the street lamp brightness according to the number of people and traffic.
The latest generation of light source LED as a new energy-saving light source has many advantages, but the current application status still has many problems. From the overall point of view, the level and quality of LED street light products are uneven, the product energy efficiency is not high, and the heat dissipation problem is not well handled. The light decays a lot and there is no reasonable lighting for the lamps.
As a new generation of light source ceramic metal halide lamps, a large number of foreign and road lighting have been used abroad, and its superior energy saving and ideal lighting effects have been widely recognized. The British government has been encouraging the use of white light sources in road lighting since 2003; Seoul, South Korea has implemented road lighting renovation since 2010, replacing all high-pressure sodium lamps with metal halide lamps (especially ceramic metal halide lamps). Ceramic metal halide lamps have long life, high luminous efficiency and excellent color rendering. The general color rendering index is 80~90 or more, and the light color is whiter and softer, which ensures the safety in road lighting.
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