The measurement of high-power light emitting diodes (LEDs) has been difficult because they are highly sensitive to thermal operating conditions, and there has been a lack of common methods that can be used by both LED manufactures and users to acquire reproducible results. We have developed a new, practical method for measurement of high-power LEDs at any specified junction temperature. A temperature-controlled heat sink is used to set and control an LED to a specified junction temperature and the measurement of optical quantities is performed under conventional DC operation conditions to achieve accurate, reproducible, and inter comparable measurement results using existing measurement facilities in the lighting industry. Furthermore, by using this new method, the thermal resistance of an LED between the junction and the heat sink surface are also determined at the same time in addition to the optical quantities.
Proceedings Title: The CIE Expert Symposium 2008 on Advances in Photometry and Colorimetry
Volume: CIE x033:2008
Conference Dates: July 7-11, 2008
Conference Location: Turin, IT
Pub Type: Conferences
High-Power, LED, Measurement, New method