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发表于 2013-6-26 13:43
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The LED module shall be switched on and the power monitored (at the input side) and: w. d+ a, M1 \2 q! g6 k* I: c
increased until 150 % of the rated voltage, current or power is reached. The voltage or the
% ~6 c& y4 g& K+ Z- r- ?current shall be increased until 150 % of the rated power is reached. The test shall be
% @4 Z& }8 m3 W( [6 ^continued until the LED module is thermally stabilised. A stable condition is reached, if the7 { p' a! M1 ?3 i) Z6 S
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
# L& ^' w) D! sthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the
0 v. x1 l: X7 j- P$ d( htime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.7 \: Z4 X9 P \; _% m+ f, S7 O
6 G5 `: v! y# q' F* ]% }& X. a; [
If the module contains an automatic protective device or circuit which limits the power, it is
4 U* F* c, o& h4 e2 F vsubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power5 c7 H7 L9 a' q3 M" ^
over this period, the module has passed the test, provided the compliance (4.1 and last
8 |/ D9 P u$ c/ L6 \ n c+ m6 bparagraph of 13.2) is fulfilled.
/ I+ w$ [, J4 ~" kAfter finalising the overpower mode, the module is operated under normal conditions until
" b. H S* f; c/ B, n. Gthermally being stable.. g# w) {/ p5 b* M8 U+ p' S+ A
A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
: d! C$ j" |7 G( z. t* r" w+ B% qoverpower condition has been withstood. To check whether molten material might present a' z2 d' S1 x# g- }, i8 ^* H
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module
7 f$ i+ |1 B" ~7 P2 \5 rshall not ignite. |
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