High power LED can provide a brighter, more cost-effective lighting

The results show that CREE (CREE) XR-E series of high-power LED becamethat year breakthrough technology list (see page thirty-ninth of the November 2006 16 issue of "White Power LED Lights The Way With A 160-Lumen Output"). CREE has been sparing no effort to improve the XR-E series products.

After the film, packaging and material aspects of continuous improvement, CREE launched a series of cold light LED products. These LED lights are improved versions of the XLamp series with higher efficiency, with good color stability throughout the lifetime. "CREE's project manager Deb Lovig said.

Cold light specification

The above cold light LED lamp can provide up to 250 lumens of cold white light output - an increase of up to 56%. It's cold white light output (5000K to 10000K color correction temperature or CCT) in the current of 350mA up to 114 lumens, the effect of more than 90 lumens / watt.

In addition, CREE has also developed a series of light products, mainly for general indoor lighting, but also in foreign countries are often used for outdoor applications. The neutral and warm white LED (3700K 5000K CCT) at 350mA current output of 80.6 lumens, efficiency up to 67 LM / W, and the effect of color temperature and compact fluorescent lamps of the same value.

"These are the best values for a packaged high power LED report. CREE solid state lighting product manager Paul Scheidt pointed out. The results were validated by the National Institute of standards and Technology (NIST).

The high power white LED chip is fabricated on silicon carbide (SiC) substrate, and there is a layer of indium nitride (InGaN) layer on the substrate. The profile of the chip for the reflow soldering is only 7X9mm (Figure 1).

Solid state light source is more efficient than traditional light source and has a longer lifetime. They do not require a lot of maintenance operations, so that they become a large number of ordinary lighting and backlight equipment high price alternatives. The solid state light source with the fast popularization, common for office buildings, parking lot, outdoor and indoor lighting, automatic headlights, garage and warehouse compartment lighting, camera flash and projection display even flashlight.

As a matter of fact, LED lighting has made CREE's headquarters in the parking lot and the hall a lot brighter (Figure 2). More and more lighting equipment manufacturers use CREE's LED light source in their industrial and household products.

Light LED on the street

According to the U.S. Department of energy (DOE), the United States 22% of electricity for lighting. DOE claims that in the next 20 years, LED lighting will be rapidly gaining popularity in the United States, can reduce the demand for lighting electricity by 62%. In addition, it can eliminate 2.58 tons of silicon dioxide emissions, the construction of less than 133 new power plants. The use of LED lighting can make financial savings of $about 115000000000.

LED City organizations can testify. Toronto, An Arbor, Mich and North Carolina Raleigh, participated in the government and industry organization, the main work is to assess, deployment and promote the application of LED lighting technology in the municipal infrastructure, the purpose is to save energy and protect the environment, reduce maintenance costs, and provide better light quality, improve the visibility and safety.

"We believe that the benefits of cost savings and LED lighting are, at the moment, practical and can be achieved. "The first mayor of the city of LED to sign the declaration of Raleigh Charles Meeker said.

Taking into account the initial costs and savings in energy conservation and maintenance costs, Raleigh estimates it will take 7 years to recover its investment in lighting. Assuming that the initial investment is $42300, the annual electricity savings of $2803, the annual maintenance costs can save $3325, the two increase by an annual rate of 3%, so you can calculate the investment recovery time of 7 years. These plans are done in May this year, when the city's municipal garage lighting pilot projects.

High power LED lamp in the first purchase cost is still higher than the traditional light source, but the price gap is narrowing. "Scheidt said," our goal is to make LED in the long term is more cost-effective, because they have a longer life and lower maintenance requirements, less energy consumption, higher energy efficiency, and help create more eco friendly environment. "

For example, the city of Ann Arbor will be installed in the next two years more than 1 thousand LED street lights, the goal is to achieve 50% of the energy savings, and plans to recover the initial investment in solid state lighting in 3.8 years. The city believes that the full realization of the LED in the city can save half of public energy use, thus reducing the annual 2425 tons of greenhouse gas emissions, equivalent to less than a year on the road to a total of 400 cars.

"Our investment plan is based on three years of related LED lighting energy and maintenance research results, saving residents survey and 25 LED lights used to cover the entire neighborhood very successfully made the pilot project. "Ann Arbor mayor John Hieftje said.

Toronto has the same blueprint for development. , led by the Canadian Association for business development in Toronto in the past 4 years, has used LED to switch from holiday lighting to retail displays and street lights.

"Over the next 10 years, you will see that street lights all over Toronto have been converted to LED, or are being converted, because LED lights can reduce energy consumption by more than 50%. Vice mayor Joe Pantalone pointed out, this can save a lot of taxpayers' money, and better protect the environment in Toronto. "

Source: electronic system design