The U.S. Department of Energy's CALiPER program has released Report 20.4, which is part of a series of investigations on LED PAR38 lamps. Report 20.4 focuses on lumen maintenance, chromaticity maintenance, and catastrophic failure in 32 of the Series 20 LED PAR38 lamps and eight benchmark lamps, which were monitored for nearly 14,000 hours at ambient temperatures between 44°C and 45°C. Among the findings: