So far there is no possibility to measure the temperature of the P/N junction directly. Because of the not very well defined thermal resistance between LED and heat sink thermal and electrical measurement conditions are often irreproducible. The concept of pulsed LED measurement allows the user to determine forward voltage, photometric and colorimetric values without any influence of self heating effects of the LED at a given junction temperature. Later in continuous mode the forward voltage can be used as a reference for the temperature of the P/N junction and the thermal resistance of the LED package can be calculated.
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