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IEC62612里面有说明。
. H2 J$ V: O1 T% MThe LED lamp shall be operated for at, X& o8 o! t; W5 J3 I. c
least 30 min and it is considered stable and suitable for test purpose, if the relative* z$ p3 { B# u$ ^$ Y! H5 O
difference of maximum and minimum readings of light output and electrical power0 Q% I4 H. H3 @: |0 o
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED
3 }1 A3 P P7 {6 K9 F! d! e. ?/ plamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable2 P3 v6 U2 b6 Y! i+ v5 k6 {
if the readings of the last 15 min meet above requirement. |
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