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IEC62612里面有说明。; T$ C5 @4 n: K' h3 E1 ]9 _
The LED lamp shall be operated for at( H- r7 L, t. W5 T( s7 T
least 30 min and it is considered stable and suitable for test purpose, if the relative
+ g D! x* Q9 K4 I+ J# Wdifference of maximum and minimum readings of light output and electrical power5 g( g1 H/ G0 u& Q \
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED& y' S8 G4 S5 f u4 h$ |* A
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable
: @- D% j% v% Q8 d' A3 O# ~if the readings of the last 15 min meet above requirement. |
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