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IEC62612里面有说明。
$ a4 r1 t0 m+ Q# d6 J* b8 qThe LED lamp shall be operated for at2 J- u$ `" W7 a7 ~) {# W$ E4 N! a
least 30 min and it is considered stable and suitable for test purpose, if the relative- L' f. n5 r6 }' Y( R, ]2 }) w& ]
difference of maximum and minimum readings of light output and electrical power
% q3 w/ ~- g6 l3 ?observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED, w$ f4 L; R( P. b [% s, L
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable3 B7 v( S7 V9 E& M: X3 u+ A
if the readings of the last 15 min meet above requirement. |
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