The energy saving and development of LED street lighting

Now at home and abroad with high pressure sodium street lighting as the main source , accounting for over 95% of the total street lights , other light sources are: metal halide , ceramic metal halide lamps , buy led high bay lamps high pressure sodium lamps for domestic use now have more than one hundred million only .
HPS work arc discharge state, V - Ante Star curve slope is negative , that is the lamp current rise , while the lamp voltage has dropped . Under conditions of constant power supply , in order to ensure stable work lamp , the circuit must be connected in series with the circuit elements of a positive resistance characteristic to balance this negative resistance characteristics , stable operating current , the device is called ballast or flow restrictor . Currently supporting the use of high-pressure sodium and more than 99 % of the ballast ballast, the other for electronic ballasts.
Now at home and abroad to drive inductive ballast high pressure sodium lamp lighting the way , the country has more than 60% of street lights not in use to improve the power factor capacitors , which makes no street lights power factor capacitors are about 40%. The United States and Europe from the beginning of the development of laws , mandatory for all luminaires power factor of not less than 80%. Thus , adding a capacitor in a magnetic ballasts are Europe, Japan and along the learning nearly a century for a variety of lighting to enhance the power factor . Existing street light ballast itself a great power , a 250W sodium lamp , its magnetic ballast itself consumes up to 50W.
In addition, the findings indicate that in the "middle vision " condition, high pressure sodium lamp luminous flux utilization declined significantly , which greatly reduces the effective optical efficiency high pressure sodium and metal halide light efficiency is less than effective .
High pressure sodium lamps energy saving methods at home and abroad are the following : to enhance the efficiency of sodium supply , the installation of a capacitor within the existing magnetic ballast lighting, power factor will be raised to between 80 to 90%, this method can not produce streetlights saving effect ; enhance sodium saving efficiency , ie reducing the existing sodium lamp ballast own consumption ; over voltage fluctuations , street work efficiency remains stable ; over how much traffic flow and adjust the brightness of streetlights .
The latest generation of energy-saving light source buy led high bay lamps as the new darling has many advantages , but there are still many problems in application status , on the whole , the level of led lights products of varying quality, energy efficiency is not high , the heat problem is not handled well , big bad light , there is no reasonable lamps with light.
As compared to the new generation ceramic metal halide light sources , foreign countries have a lot of use and road lighting, ideal for its superior energy efficiency and lighting effects are widely recognized. From 2003 the British government began to encourage the use of white light source in road lighting ; Seoul, Korea from 2010 began the transformation of road lighting , replaced all the high-pressure sodium metal halide ( particularly ceramic metal halide lamp ) . Ceramic metal halide long life, high luminous efficiency, color rendering is very good, the general color rendering index of 80 to 90 or more, light color whiter , softer, which ensures the security of reliable lighting of the road .

More info you can visit:  http://www.lead-lighting.com/products/sid20-1.htm