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IEC62612里面有说明。: _0 _9 s: e* O E# @
The LED lamp shall be operated for at. U; T5 W# @4 W* @) h- s
least 30 min and it is considered stable and suitable for test purpose, if the relative
4 B6 Q2 J. o, i; _0 Ydifference of maximum and minimum readings of light output and electrical power
1 n% D5 p) u1 q W) wobserved over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED' W( m+ O! ?1 D$ t8 X+ |, a' L& l
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable
. k9 o: U/ y% |' F( B8 x/ w; tif the readings of the last 15 min meet above requirement. |
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