Following the first round of testing by the US Department of Energy's Solid State Lighting Commodity Testing Program (December 2006-February 2007), the second round of testing (March-May 2007) has also ended. This round tested 13 SSL products representing a range of applications, designs and manufacturers. All products use spectroradiometric test, goniophotometric measurement, and temperature test (measuring the highest accessible hot spot of the luminaire) and off-state power consumption, but not including lumen fading test and other forms of products. Reliability testing (these will be done in a future test plan).
The lighting test laboratory tests the entire SSL luminaire according to the inspection process specified in LM-79, instead of separately testing the lamp level and luminaire efficacy as in the traditional test, or only measuring the LED device without the control electronics and heat sink. Array. This is because there is currently no standard industry test flow for measuring LED devices or arrays. On the other hand, LED performance is temperature sensitive. Different luminaire designs have substantial performance for the LED devices or arrays used. Impact, which makes the LM-79 the basis for evaluating the energy efficiency of SSL products.
Table 1 summarizes the performance of all products in the second round of CPTP testing (including light output, luminaire efficiency, correlated color temperature, color rendering index). In order to provide preliminary exploration of the differences between individuals in the same product, benchmark data on other lighting technologies, and taking into account the initial rotation test, the selection of products was arranged in the second round.
To enhance the observation of individual differences, the second round tested both samples of each replacement bulb and fixture. In order to enhance the direct comparison between different lamps and light sources, each table lamp is provided with a LED version and a halogen version for comparison. In order to study the differences between the test instruments and the means, four previously determined independent laboratories performed a rotation test on the replacement bulb and the complete lamp.
In addition to providing performance based on LM-79, photometric data published by SSL product manufacturers were also collected and analyzed for comparison.
Test results analysis and comments
First, energy use and light output
The second round of testing tested a wide range of products, from very low-power A-lamp replacement bulbs (with lumens smaller than typical 7W incandescent lamps) to more powerful downlights. The efficiency results have a similar range, from work lights/table lamps with low power to halogen lamps, to downlights and freezer display box lights with efficiency and light output comparable to fluorescent technology.
Second, the lack of trust in the manufacturer's product information
In the first round of testing, we have learned the main difference between the manufacturer's product data and the actual measured output and power values. The second round of test results have generally not improved. Except for the product data values ​​of the two products and the test values, all other products claimed to have an exaggerated efficiency and lumen output of 25%-35%, and the light output was exaggerated by 30%-95%. Some product data does not provide power and light output data, but contains statements that may be completely misunderstood.
The difference between the product data and the actual measured value may be caused by the following reasons:
The lumen output and power value on the product data sheet may be the rated performance of the LED device published by the LED device manufacturer. Until now, there is no standard test method to measure the performance of independent LED devices, and there is no reliable and consistent way to directly and accurately predict the performance of LED devices combined with power circuits and heat sinks through the performance of LED devices.
There are some product data that clearly indicate that the output and power values ​​are for the LED device and not for the entire fixture. And some product information has not been clearly pointed out, leaving only data to make people guess.
The performance data published by the luminaire manufacturer may differ in the method and conditions used in the measurement as specified by the LM-79. In some cases, vendors may specify the testing process they wish to follow. Or the testing laboratory used a test procedure that was not used by the LM-79 (LM-79 is still a draft standard that has not yet been published, and some laboratories are not familiar with it).
The data published by the luminaire manufacturer may conform to a product structure, but this product structure is different from the product group version specified and tested by the DOE test project.
It is possible for luminaire manufacturers to modify the data to exaggerate performance.
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