According to the reports from the U.S. Department of Energy (DOE), the LED lamp from Philips that won the L Prize in the 60 W replacement category has shown no reduction in light output after 25,000 hours of continuous lumen maintenance testing. The prize was awarded in August 2011. DOE has tested 200 Philips lamps for 7,000 hours in a specially constructed high-temperature (45° C) facility, so it predicted the Philips lamps would keep lumen maintenance of 97.1% at 25,000 hours. Even though this far exceeded the competition’s 70% requirement, DOE&rsquo...