Han Mingqing: How far is green lighting from Hangzhou?

China has a large population and energy shortage. The implementation of environmental protection and energy conservation is an effective way to control environmental pollution and save energy. At the two sessions this year, some representatives proposed the use of environmentally friendly energy-saving (LED) lighting in public places.

At present, most of the lighting in public places in China (such as traffic tunnels, streets, parks, etc.) use traditional power supply lighting methods, which consume huge amounts of electricity every day. The annual electricity and maintenance costs are also an astonishing number, and they are quite To a certain extent, it has caused a situation of power shortage.

The representative said that compared with traditional general lighting, LED lighting has good light color, long service life, low maintenance cost, and more importantly, it can greatly save energy. Therefore, it is recommended to formulate relevant policies in economically developed cities, districts, streets, etc. Public places first promote the use of LED lighting, and the annual energy-saving lighting renovation plan is determined by various places.

As the Hangzhou area with relatively developed economy and relatively tight electric energy, can it be the first to modify LED lighting?

In Hangzhou, the annual energy consumption for street lamps is 55 million kWh, which is only in urban areas. In the 21st century when resources are tight, in Hangzhou, where electricity is frequently absent, this per capita energy consumption data, even if it is reduced by 1 percentage point, can make Hangzhou in development a sigh of relief.

This is only the consumption of street lamps, not including various landscape lights, decorative lights, etc., and does not count the annual growth rate of 6%-7% of lighting facilities. It is imperative to promote green lighting. At present, LED lighting, which is constantly reducing in cost, has naturally been hoped by many people.

Per capita street lamp energy consumption, Hangzhou is four or five times that of Paris

status quo

The Lingyin Road at night, clear, quiet, and bright street lights, has made this forest road popular with many night visitors. "There are three heads on one lamp, each with 150 watts of light bulbs, which together are 450 watts. In Paris, such a distance, such a road pass condition, a 100 watt street lamp is enough. ”

Han Mingqing, deputy director of the Hangzhou Lighting Office, has visited the lighting conditions of many foreign cities and is familiar with the street lights in Hangzhou. The lights on Lingyin Road, in his view, there is a waste of resources.

There are 100,000 street lamps in downtown Hangzhou. The urban population of Paris is four or five times that of Hangzhou. The city is also much larger, but the number of street lamps is only 120,000. In terms of per capita energy consumption, it is only one-fifth of Hangzhou. about.

High power consumption not only wastes resources, but also indirectly causes environmental pollution. Electricity is produced by the combustion of coal, and the large amount of carbon dioxide emitted thereby contributes greatly to climate warming.

Replace the LED lighting at the right place, saving 30%-40%

Conception

The existing lighting power consumption is too high, and it is necessary to introduce a new type of green lighting source, and many people have thought of LEDs.

LEDs were originally a kind of semiconductor material. Since this material can also emit light, it has been introduced into the field of illumination by scientists in recent years.

What are the advantages of LED? Han Mingqing gave us a simple example. Ordinary incandescent lamps, the luminous efficacy per watt is only 15 lumens (lumen refers to the visual brightness of an object), because it needs to rely on the filament to burn red, so most of the energy is turned into heat dissipation; and the general energy-saving lamps, The luminous efficiency per watt is 40 lumens; the high-pressure sodium lamp is also a new type of lighting material. The luminous efficiency per watt is 100 lumens. Although it is very bright, it has a fatal weakness, yellowing effect and poor color rendering.


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