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IEC62612里面有说明。/ Q1 f# z1 E4 X2 ?) n+ t2 |+ |" \
The LED lamp shall be operated for at
! k: m( ^" f0 j& `least 30 min and it is considered stable and suitable for test purpose, if the relative
( w$ k! U6 j6 e6 j! p; ]2 Bdifference of maximum and minimum readings of light output and electrical power% |5 x5 X/ @" f( R" k8 _7 f" U6 w
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED
3 ?) a$ q9 O5 g/ _$ Y0 e( J% J& u/ nlamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable
* {9 P3 R0 F# M8 P4 zif the readings of the last 15 min meet above requirement. |
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