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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% q& i* B) G$ ~1 w: ]. J" @. r
increased until 150 % of the rated voltage, current or power is reached. The voltage or the' f: h- j: |6 x* E4 ^1 ?
current shall be increased until 150 % of the rated power is reached. The test shall be
& G0 s4 q6 D2 ]' I* Vcontinued until the LED module is thermally stabilised. A stable condition is reached, if the/ H" l* O' u! T" u7 u4 @3 @( X
temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
* W7 i2 s9 M: Qthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the
+ S; z+ l9 E( Xtime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.. X I" _# {' _+ n! S1 u# t
3 O7 B7 u; f7 C' V5 n- kIf the module contains an automatic protective device or circuit which limits the power, it is
+ N! C4 |; K& ^( ]; ~( V% Asubjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
: Q4 \. ^; s2 O4 m, ]3 e: G5 e* rover this period, the module has passed the test, provided the compliance (4.1 and last5 q7 P7 v A0 a6 T
paragraph of 13.2) is fulfilled., E' |' H1 s2 U; Z5 _5 p
After finalising the overpower mode, the module is operated under normal conditions until
! g; t/ U5 C5 B$ V1 ?thermally being stable.
! d0 S7 ]& n8 WA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
& ~# a4 d( O, }/ Noverpower condition has been withstood. To check whether molten material might present a e( S# V" [( Q; e
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module: _* t+ D' C+ g5 f! @4 M( _5 J
shall not ignite. |
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