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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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MeasurementandCalibration

IntegrationTime

Alongintegration timewillinducethermalissuesin LEDmeasurements. If theintegration timeis1

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.

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RecommendedMethod

1. UsemeasurementinstrumentswhichfollowtheCIE127standards.Theintegrationtimeshould

beshorterthan15ms.

2. Iftheoperatorusesnonstandardtesters,calibratethetesterwiththegoldensamplebefore

measurement.ThegoldensampleshouldbemeasuredbytheinstrumentfollowingCIE127

standards(ea.ISCAS

140B).

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