Indirect Estimation of Thermal Regime of Operation of Power LEDs

- This paper presents an instrument for automated measurement of temperature dependence of voltampere and lumen-ampere characteristics of LEDs. It consists of a programmable current source, temperature control module, current and luminous flux measuring units. This device allows to carry out measurements at a stable linear heating of the semiconductor LED with a speed up to 20 °C/min maintaining a constant temperature with an accuracy of 1,5 °C. A wide range of current measurements is provided - from 25 μA to 800 mA with a current control step of not less than 0.4 μA.