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IEC62612里面有说明。- R8 ~" K# w6 e6 i8 @1 Z
The LED lamp shall be operated for at, [$ P* F% x+ H F: J/ G5 S( ^
least 30 min and it is considered stable and suitable for test purpose, if the relative; _8 C- [, S: B( s
difference of maximum and minimum readings of light output and electrical power6 x; r1 a; C0 K) \' z
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED
8 }# D, {% e6 f% Blamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable
$ d1 l4 i% F. o1 J" F" d: ]( Q+ {' c+ D# @if the readings of the last 15 min meet above requirement. |
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