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IEC62612里面有说明。3 ^+ {! {. I5 `5 k Y' @, l* m
The LED lamp shall be operated for at
5 F7 I$ H8 }, O [0 T/ Y* ileast 30 min and it is considered stable and suitable for test purpose, if the relative& Q$ r' g; ^( `7 b$ I3 J
difference of maximum and minimum readings of light output and electrical power/ S2 d" ^) g6 g$ V, `# f
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED
' q4 [3 A! ]# S- y! I0 F& {* Ulamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable4 \2 I& O0 Z# b1 z( \# l
if the readings of the last 15 min meet above requirement. |
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