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IEC62612里面有说明。* P1 r" y) A' A# l& n" P/ }5 P+ C
The LED lamp shall be operated for at i# R# h: \! t2 k9 v" Z3 q
least 30 min and it is considered stable and suitable for test purpose, if the relative
" M& a, x( }) W' Rdifference of maximum and minimum readings of light output and electrical power' a1 K0 d n7 V6 z# `% M
observed over the last 15 minutes is less than 0,5 % of the minimum reading. If the LED/ a- I" G1 E- o5 j/ ~
lamp is pre-burned, it does not need to be operated for 30 min, and it is considered stable- i# I1 D% v! h
if the readings of the last 15 min meet above requirement. |
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