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IEC62612里面有说明。. P0 }- q* ?: q3 U( j! J6 |
The LED lamp shall be operated for at6 U2 B; W* Z( f$ k; q: R6 w3 w
least 30 min and it is considered stable and suitable for test purpose, if the relative7 k$ ?; z0 l$ P3 r
difference of maximum and minimum readings of light output and electrical power2 _) [7 F5 N7 ~' Y% C; D/ w
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED6 ~+ T* K8 C2 U1 B! W8 @
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable$ W6 `: S- ^% ^4 T+ ]
if the readings of the last 15 min meet above requirement. |
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