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C35 Application Note
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C35 Application Note V1.3
Subject to change without notice
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15
MeasurementandCalibration
IntegrationTime
Alongintegration timewillinducethermalissuesin LEDmeasurements. If theintegration timeis1
sec, the LED junction temperature (Tj) may reach over 50, which results in the light output dropping
more than 5%. It is recommended that the integration time is shorter than 25ms in high
power LED
measurements.
RecommendedMethod
1. UsemeasurementinstrumentswhichfollowtheCIE127standards.Theintegrationtimeshould
beshorterthan15ms.
2. Iftheoperatorusesnonstandardtesters,calibratethetesterwiththegoldensamplebefore
measurement.ThegoldensampleshouldbemeasuredbytheinstrumentfollowingCIE127
standards(ea.ISCAS
140B).
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