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IEC62612里面有说明。8 Y! h! b- B8 Y( \
The LED lamp shall be operated for at8 j/ t3 W4 W: G( A& s- y7 E
least 30 min and it is considered stable and suitable for test purpose, if the relative
( ^! V" v. c/ Z) X0 i! ?( bdifference of maximum and minimum readings of light output and electrical power
9 s( x8 F/ t5 g$ u1 Xobserved over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED
) l' o; |3 d/ Q) t2 i9 olamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable9 |, \6 f4 _6 d$ x" K5 V$ W3 F# _
if the readings of the last 15 min meet above requirement. |
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