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IEC62612里面有说明。; X d3 z3 E0 r+ Z8 V: m) ~: S- C
The LED lamp shall be operated for at1 V* t3 v2 a! g+ e$ U
least 30 min and it is considered stable and suitable for test purpose, if the relative7 h* m( x: w' Z* p1 ?
difference of maximum and minimum readings of light output and electrical power
8 Z, I3 a/ ^+ \& k* A% N; w! Mobserved over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED
$ J, H9 Y& `5 H% w, V1 Y2 Ilamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable
& l! p" j- f* |9 `4 Mif the readings of the last 15 min meet above requirement. |
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