U.S. releases LED bulb test results-A19, G25, MR16, PAR20, PAR30
The latest round of SSL bulb trials conducted by the US Department of Energy involved 38 products. The Strategy in Light (SIL) conference report pointed out that lumen output and CRI have generally improved.
Based on the work carried out by the Pacific Northwest National Laboratory (PNNL), the new round of LED bulb testing by the US Department of Energy (DOE) includes A19, G25, MR16, PAR20, PAR30 sample reports, these samples from 9 anonymous retailers Purchased from 18 different manufacturers. After more than 14 months of SSL retrofit testing, the PNNL report pointed out that the average cost per thousand lumens dropped from 130 US dollars per thousand lumens to 63 US dollars per thousand lumens.
The latest LED bulb test results released by DOE
PNNL conducted three sample tests on each lamp, and used an integrating sphere for LM-79 photometric test. These bulbs were purchased in the summer of 2011 and tested in the fall. According to the report, the luminous efficiency of these bulbs ranges from 36 lumens/watt to 72 lumens/watt, with an average of 53 lumens/watt. Both the minimum and maximum luminous efficiency have risen, and the luminous effect range is still relatively wide. It is expected that the luminous effect will change more and more in the future. This is because manufacturers are looking for different product types and application requirements.
This test contains 11 A19 samples. The luminous efficiency of these samples is close to 60 lumens/watt. The luminous efficiency of bulbs with power consumption less than 10 watts is 50-55 lumens/watt, and the luminous efficiency of more than 10 watts is 55-70 lumens/watt. watt. Compared with the previous round of testing, the biggest difference is 20 lumens per watt. In this test, the Ministry of Energy evaluated G25 samples for the first time, and the luminous efficiency was 35~55 lumens/watt. The report showed that although LEDG25s are better than halogen lamps, energy-saving lamps are more suitable for store shelf lighting. The test results of the MR16 and PAR20LED samples are good. The luminous efficiency of the 8 PAR30 samples tested fluctuates above and below the energy-saving lamp, and the luminous efficiency is 50-55 lumens/watt.
The color temperature range of all samples tested is 2500K~6000K, and most of the samples are in the range of 2700-3000K. Throughout the test, the difference in color rendering is significant. The lower prices have poor color rendering. Some samples have a color rendering index of less than 70, and most samples are around 80.
However, some samples of the tested products have size and shape problems. 6 of the 11 A19 bulbs are not in compliance with the American National Standards Institute (ANSI) specifications, 2 of the 5 PAR20 samples are too long in size, and 9 of the PAR30 samples have 4 sizes are too long.
The report also pointed out that most manufacturers seem to focus on high-lumen lamps, but apartments and small rooms require less lighting output. Instead, it is difficult to find 400-lumen bulbs on the market.
