PNNL on each lights a test of three samples, using the integrating sphere LM-79photometric tests, these bulbs purchased in the summer of 2011, tests conducted in the fall. The report said these bulbs luminous efficiency 36 lm / W to 72 lumens / W ranging from an average of 53 lumens / watt. Minimum and maximum luminous efficiency hasincreased, the scope of the luminous efficiency is still wide, high powered led bulbs, the expected range of futurechanges in the luminous efficiency is increasing. This is because manufacturers are looking for different product types and application requirements.
The test consists of 11 A19 samples, the luminous efficiency of these samples are closeto 60 lumens / watt, high powered led bulbs, the power consumption of less than 10 watts bulb light efficiency of50 to 55 lm / W luminous efficiency greater than 10 watts for 55 to 70 lumens / watt.Compared to the previous round of testing, the maximum gap of 20 lumens / watt improvement more. In this test, the Department of Energy for the first time to assess theG25 sample, luminous efficiency of 35 to 55 lm / W, the report shows, although LEDG25scompared to halogen lamps, led high bay, energy-saving lamps more suitable for application in thestore shelves lighting. MR16 and PAR20LED of sample test results better, 8 PAR30sample being tested luminous efficiency, luminous efficiency of 50 to 55 lm / W in theenergy-saving lamps, plus or minus.
The test sample color temperature range of 2500K ~ 6000K, most of the samples in the2700-3000K range of. The entire test, the color difference was significantly lower pricesto the poor color rendering, color rendering index of some samples below 70, high powered led bulbs, most of thesamples is about 80.
But some samples in the test products exist size and shape, length of 6 11 A19 bulbdoes not meet the American National Standards Institute (ANSI) specification, 5 PAR20sample, there are two sizes too long, 9 PAR30 samples four dimensions is too long.
The report also pointed out that most manufacturers seem to be concentrated inhigh-lumen lamps, apartments and small rooms require less light output, on the contrary, high powered led bulbs, the market is difficult to find the standard light bulb of 400 lumens.