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IEC62612里面有说明。: D/ O* W( m8 @1 b. {: d
The LED lamp shall be operated for at
( D; e% e: T2 R2 c2 w- \least 30 min and it is considered stable and suitable for test purpose, if the relative
: H: e+ _. v* K' V& K6 kdifference of maximum and minimum readings of light output and electrical power' z( Z1 S, U0 h0 c) H
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED2 d9 ~* T+ s! o
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable& L( f/ X1 S( U8 q- w9 u% f
if the readings of the last 15 min meet above requirement. |
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