LED光源的引入改變了照明產品的標簽和描述方式。而在普通的說法，瓦數是用來表示亮度，如，“一個60瓦的燈泡”LED的輸入功率和輸出光通急劇變化的相關性：亮度相當于一個15-w LED燈泡確實很亮。改變燈泡性能的必要性導致了聯邦政府今年對燈泡的要求，要求新的包裝標簽——照明事實標簽（圖1）。當然，有了這個要求，就需要進行標準化測試以獲得標記數據。

Figure 1: All light bulbs sold in the U.S. must now be labeled using the above label formats. In addition to wattage, the labels include brightness measured in lumens and light appearance in CCT (Kelvin). Based on three hours of usage per day, manufacturers must also provide the bulb’s life expectancy in years and its yearly operating cost at an 11￠/Whr electricity cost. (Source: U.S. Federal Trade Commission).?

At first, the U. S. Department of Energy (DOE) initiated the CALiPER program to establish a process for qualifying testing laboratories, including verification of laboratory competence, equipment, and experience, along with round-robin testing on a regular basis. But with the advent of SSL testing standards from the Illumination Engineering Society (IES), things changed. As of March 5, 2009, the National Voluntary Laboratory Accreditation Program (NVLAP), which provides third-party accreditation to testing and calibration laboratories, started accepting applications for solid-state lighting (SSL) test methods (LM-79 and LM-80) as part of its Energy Efficient Lighting Products laboratory accreditation program. With the NVLAP process for LM-79 accreditation now available, the DoE no longer conducts its own lab qualification and round-robin testing.?