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IEC62612里面有说明。
' W- `1 q8 _- |+ @7 eThe LED lamp shall be operated for at: z4 K ]2 G- Y
least 30 min and it is considered stable and suitable for test purpose, if the relative
6 h, O8 I- V. q r5 h" ?' ]5 Gdifference of maximum and minimum readings of light output and electrical power
+ b. g0 U+ s6 p# y0 |observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED/ g9 Z3 h. X+ |4 U# P% F2 U& q
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable0 r( t' r# m1 u/ b1 K
if the readings of the last 15 min meet above requirement. |
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