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IEC62612里面有说明。
3 i0 `+ b2 }# ], ^3 Y4 |) TThe LED lamp shall be operated for at3 C* z2 D g, D$ F9 j* J
least 30 min and it is considered stable and suitable for test purpose, if the relative1 v8 ]( f- S+ T b4 [9 w
difference of maximum and minimum readings of light output and electrical power
5 z& z: d' `8 Hobserved over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED4 O" v, s8 r/ L7 ^. H
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable0 N% d+ f4 b3 W f6 X
if the readings of the last 15 min meet above requirement. |
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