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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) and9 O. t) q% H. l6 x" a' o
increased until 150 % of the rated voltage, current or power is reached. The voltage or the3 u6 z) U3 o; Z0 o8 N
current shall be increased until 150 % of the rated power is reached. The test shall be( x( Z. ~4 N( Z% P. x" a; T
continued until the LED module is thermally stabilised. A stable condition is reached, if the2 n$ A/ \% c" ?2 r8 o6 S8 d' i
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in1 d! ^( [& j/ o5 D5 ~
the tc point. The LED module shall withstand the overpower condition for at least 15 min, the! M" X7 X/ c p
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.) m6 v9 K4 j! l+ r! S
; A# C# t0 _3 }! L" x) ?If the module contains an automatic protective device or circuit which limits the power, it is
* ]5 q% d1 G! t2 i4 I5 zsubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power+ Y) `9 U* {( Q9 z% X9 }8 K
over this period, the module has passed the test, provided the compliance (4.1 and last' h0 V* f- W. j$ X5 u
paragraph of 13.2) is fulfilled.' G, b; o& s1 ]4 f; ~
After finalising the overpower mode, the module is operated under normal conditions until. y& A; j) H. L4 g: S" y# Q8 o
thermally being stable.
4 W4 [- F/ |8 x! }- M7 cA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
; Q0 L* N% l4 c _9 N5 A3 B6 C Roverpower condition has been withstood. To check whether molten material might present a" @* N- A- ` \4 `* o
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module8 @: `- x5 n* T$ [6 k4 `
shall not ignite. |
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