Alternating-current (AC) driven high-power LEDs are available and used in SSL products. AC LEDs operate directly from a mains supply and thus have advantages in simplifying product design, increasing product reliability, and extending product lifetime. Accurate measurement of AC high-power LEDs is required for quality control and product qualifications such as US Energy Stars. We have developed a simple, robust method for measurement of high-power LEDs at any specified junction temperature under a normal AC operating condition. In addition to optical quantities, the measurement of an AC LED also determines the thermal resistance between the LED junction and the heat sink.
Proceedings Title: CIE Midterm Meeting and the Light and Lighting Conference
Conference Dates: May 27-29, 2009
Conference Location: Budapest, -1
Pub Type: Conferences
AC LED, High-Power LED, Junction temperature, Measurement method