Ren Yuan: LED street lighting applications do not easily replace

Abstract: China aviation industry planning and Design Institute Ren Yuan will think of high-power LED street lamp should be after several years or several years of hard work, and constantly improve themselves, in order to road lighting has become a high quality and efficiency of the new type of light source, lamps, for users to choose. Allow users to speak, so that the effect of evaluation.

LED in the white light after the advent of a new look, so that LED as a new light source into the field of lighting possible. In more than and 10 years, LED technology and product development is very rapid, large power LED chip, package, etc. to solve the problem of heat to continue to move forward in recent years developed a variety of road lighting, and was applied to the township and village roads, residential road, city branch, and further to the city road trial. Due to the high efficiency of LED light source is widely used in different now, due to the characteristics of LED, such as light direction, adjustable light, long life, vibration resistance, weather resistance and other advantages, and the obvious problems existing in the application of he and the insufficiency, in the lighting industry, and all sectors of society caused by different reaction is understandable.

Here are a few applications on LED street lamps and now widely used high-pressure sodium lamps for a comparison.

1, a comparative analysis on energy efficiency

Shall reach the same illuminance (luminance) level, close to the premise of lighting quality standards under their power lighting installation. Due to high pressure sodium lamp power (250~400W) of high light efficiency, up to 130~1401m/W, and a small power tube (100~150W) optical efficiency is about 80~1001m/W, and the use of high-power LED street lamp with 1WLED tube, the light efficiency are similar, so appropriate respectively of high power and small power lamp of lamp.

(1) high power (more than 250W) high pressure sodium lamp: high luminous efficiency, considering the ballast loss, lighting efficiency and light utilization rate of three factors, the comprehensive efficiency by 0.55, the effective optical efficiency is sodium lamp is about 70~751m/W; and the LED lamp effective light effect, at present the United States is about 621m/W, the best domestic enterprises has reached 56~581m/W. Therefore, for high power street lamps, the current LED is lower than the energy efficiency of sodium lamp.

(2) low power (150W) lamp. The effective light efficiency of sodium lamp (included in the comprehensive efficiency of 0.55) is about 45~551m/W, while the LED is still 56~581m/W, then LED can achieve energy saving 10%~20% than sodium lamp, up to 30%.

From the analysis that for small power branch (150W), LED street lamp energy saving ratio up to 10%~30%, while the power is still less than the energy efficiency of sodium lamp. Therefore, those generally claimed that LED street lamps than high-pressure sodium lamp energy saving, and even energy saving 50%, 60% and other claims, it is clear that the hype and speculation. We should adhere to the principle of scientific analysis and seeking truth from facts, otherwise it is easy to mislead users and the masses.

Analysis on the effect of road lighting, 2 light source

Temperature high-pressure sodium lamp (Tcp) is about 2100K, is a warm color, the color index (Ra) is only 23~25, color is low; while LED lights now use the color temperature of more than 5300K, the temperature is cool, good products, its Ra is 70~80, good color.

As motor vehicles on the road, the main road, yellow light lamp, to see about 90~160m distance to road conditions, slightly better effect than white light, especially for the fog, dusty air condition, sodium lamp has more advantages.

For sidewalks, pedestrian street, residential road, LED color is better than that of sodium, know the situation clearer, more advantages.

3, economic analysis, comparison

High pressure sodium lamps, each about 1200~1500 yuan; the LED lamp, according to the power of different sizes, the price difference is large, about 4000~8000 yuan. On the status quo, LED street lamp is too expensive, the price of up to 3~5 times the huge. As before, less than 150W LED can save energy 10%~30%, each year about 50~150KWh of the Lantern Festival, simply can not recover the cost of the purchase of more light. Can only be expected in the next few years, LED development trend to see its price will gradually decline, further improve energy efficiency, and then compare its economic performance.

4, service life analysis and comparison

Service life should be based on the whole lamp life. High pressure sodium lamp, including light source, electrical accessories (mainly ballasts, triggers) and lamps, sodium lamp used in the average life of 3~5 years, energy saving inductance ballast will not be less than 20 years, lamps and so on. The use of LED street lamp life experience, the existing enterprise known as 50 thousand, 60 thousand hours, there is no reliable basis. The United States Energy Star requirements for the division is not less than 35000h and 25000h two files, LED is the main chip of life is very long, but with the package after the temperature, the relationship of many factors such as heat dissipation greatly, in addition to the driving circuit device of electronic components such as capacitors life, often only 8000h to 10000H. So the whole said, LED street lamp life can not compare with sodium lamp street lamp.

5, maintain performance comparison

To administrative departments of city street as the representative of the users, more concerned about street maintenance performance. According to the analysis, sodium lamp maintenance performance is good, as long as the scrub, do not have to replace, ballast is rarely replaced, the light source 3~5 replacement, but also very convenient. The LED street lamp, involving LED tube, (including lens module etc.), power supply device, possibility of components damaged greatly, have difficulty in maintenance and replacement, it is likely to replace the whole, cost is higher, the future remains to be solved. LED street lamp has no standard to follow, on the tender, order, the use, maintenance are unfavorable.

To sum up, we believe that LED street lamp