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IEC62612里面有说明。
4 k5 Q" }9 v g. ^, f6 A- dThe LED lamp shall be operated for at
! W$ d6 b# g9 Y8 h* `$ T0 p' yleast 30 min and it is considered stable and suitable for test purpose, if the relative& O0 a3 w' Y! C/ t D
difference of maximum and minimum readings of light output and electrical power
8 a9 Y5 n5 v4 Vobserved over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED1 H2 |: |3 X! u2 z. p, K9 M
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable
$ G3 Y% a# H, {if the readings of the last 15 min meet above requirement. |
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