Evaluation and analysis of LED street lamp replacing traditional lighting plan

With LED luminous efficiency and the increase of service life, with energy saving, energy conservation and environmental protection advantages plus, LED in the street on the application of the feasibility of replacing traditional lighting is greatly improved. In the rapid development of LED technology and product characteristics of continuous improvement, LED street lamp demonstration project was launched in all countries, through the evaluation and analysis of LED street lamp demonstration program, to provide governments with LED manufacturers for a reference in the future application of street lamp on the market.

LED street lamp demonstration program - California, Oakland

LED street lamp demonstration to plan the United States Energy Bureau in California Oakland city evaluation as an example, the project adopted two stage assessment process, the first phase of a study group selected parking lot in Oakland city to do the measurement and device after the device, to assess whether may have a negative impact on the safety of LED lighting in general Street actual deployment; after confirmation device of the local people without special negative influence after the second stage of way for the device and evaluation in actual road, and through the satisfaction survey of local residents, acceptance and cost estimation.

This program is a LED lighting application in the street lighting evaluation, through the LED lamp to replace the original high-pressure sodium lamp on the road in Oakland city. The evaluation method is based on four projects, including the output efficiency of light source, the use of energy and electricity, the investigation of customer satisfaction and the estimation of economic cost. This assessment project through energy saving, demand reduction, market potential, market entry barriers, increasing cost and the expected life cycle of information technology, California area can expect the technology and application of new energy into more quickly has not yet been adopted.

The purpose of this evaluation plan is to evaluate the power, light source efficiency and economic performance of high pressure sodium lamps compared to LED lamps. The potential economic demand and energy saving in average wattage and estimated annual kilowatt number evaluation; performance satisfaction degree to light intensity and uniformity, and the correlated color temperature related groups to consider, at last, economic recovery period to replace or replacement of the device (simple-payback), the life of lamps, maintenance cost and power the cost for evaluation.

Compared with the traditional lighting source, because of LED light source in the dispersion and provide the ability to better energy-saving lighting, while changing the general cognitive industry for high quality light use, is also used in the streets and general car on the road. At present, the high-pressure sodium lamp is used for lighting in the street, and the other is the use of metal halide, low pressure sodium lamp or other kinds of lighting. The use of high pressure sodium lamp is due to the high efficiency of its long service life, compared with other traditional lamps, but less in color on the selective.LED have a longer life than high pressure sodium lamp, low maintenance cost, many kinds of colors, energy consumption is low and can save cost. However, the initial cost of using LED is still higher than that of the commonly used light sources.

According to the U.S. Energy Agency report shows that the current changes in LED technology is quite fast, on the whole, LED annual luminous efficiency improvement of about 35%, the cost can be reduced by up to 20%.

Site and evaluation method

The LED street lamp demonstration program is in Sextus and Tunis in Oakland City, the two roads, to replace the high-pressure sodium lamp 121 watt to 15 original lamp 78 watt LED lamp (HPS), in order to compare with the control in the Sextus Road on the eastern side of installing new high-pressure sodium lamp, the installation of LED Tunis on the road all installed street lights; a LED lamp, and the adjacent Cairo road are equipped with a new high pressure sodium lamp. All lamps installed in all 28.5 feet above the pavement, bar spacing is 110120 or 160 feet.

The results of the study showed that the average power of each lamp LED lamp is 77.7 watts, compared to the average power of HPS high pressure sodium lamp of 121 watts, about 35% of the electricity in a year, 4100 hours of operation time, is expected to save 178 kilowatt hours a year.

In the LED test to assess each stage before, there will be a pre test operation, all tests are carried out in the evening, the light a lamp and two lamp lighting distance of 110 feet, the light from its light between three to 165 feet, between the last third and four light lamp distance 120 feet. Reasonable case, the lamp lighting uniformity should be the same, but the actual setting and evaluation, in the street intersection set can not be completely in a code in the distance from the north to the south, a distance of 12 feet, the road width adjustment to 10 feet.

The measurement and assessment of international road lighting standard (IESNA) set the lights measurement methods are slightly different, international road lighting standard to measure the position in the range below the light source distance half squares, the measuring range is measured under the direct light source and a two light source between the center position, intensity prediction the maximum and minimum value in the test range, the difference degree and record the high-pressure sodium lamp and LED lamp uniformity. While the sensor installed in the recommended position should be 6 feet off the ground. The research team considered the past measurement experience and recommendations, the measurement position is set at 18 feet, which is the combination of the three legs and the sensor can reach the lowest height.

The measurement process also includes the measurement of temperature using electronic thermometer every 20 minutes on the high-pressure sodium lamp and LED lamp were measured; in addition, the measurement of LED lamps of the night, every 30 seconds using HOBO instrument U12 data recorder has relative humidity