The latest round of SSL bulb trials conducted by the US Department of Energy involved 38 products, and the lumens output and CRI were generally improved in the Strategy in Light (SIL) conference report. Based on work performed by the Pacific Northwest National Laboratory (PNNL), the US Department of Energy (DOE)'s new round of LED bulb testing includes A19, G25, MR16, PAR20, PAR30 sample reports from nine anonymous retailers. Procurement from 18 different manufacturers. After 14 months of SSL retrofit testing, PNNL reported that the average cost per thousand lumens dropped from $130/thousand lumens to $63/thousand lumens.
PNNL tested each of the three samples and used the integrating sphere for the LM-79 photometric test, which was purchased in the summer of 2011 and tested in the fall. According to the report, the efficacy of these bulbs ranges from 36 lm/W to 72 lm/W with an average of 53 lm/W. Both the minimum and maximum light effects have increased, and the range of light effects is still wide. It is expected that the range of light effects will become larger and larger in the future. This is because manufacturers are looking for different product types and application requirements.
The test consisted of 11 A19 samples with a luminous efficacy of nearly 60 lumens per watt, a light bulb with a power consumption of less than 10 watts with a luminous efficacy of 50 to 55 lumens per watt, and a luminous efficacy of greater than 10 watts for 55 to 70 lumens per day. watt. Compared with the previous round of testing, the biggest gap is 20 lumens/watt improvement. In this test, the Ministry of Energy first evaluated the G25 sample with a luminous efficacy of 35 to 55 lumens per watt. The report shows that although the LEDG25s is better than the halogen lamps, the energy-saving lamps are more suitable for shelf lighting in stores. The test results of MR16 and PAR20LED samples are better. The light effects of the eight PAR30 samples tested are floating up and down on the energy-saving lamps, and the luminous efficiency is 50-55 lm/W.
All samples tested ranged in color temperature from 2500K to 6000K, and most samples ranged from 2700 to 3000K. In the whole test, the color rendering difference was significant, and the lower the price, the color rendering was poor. Some samples had a color rendering index of less than 70, and most of the samples were around 80.
However, some samples in the test product have size and shape problems. Six of the 11 A19 bulbs do not meet the American National Standards Institute (ANSI) specifications. Two of the five PAR20 samples are too long, and nine of the PAR30 samples are included. 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, and it is difficult to find a 400-lumen light bulb on the market.
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