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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' |! s% ^3 K. V8 I4 F* [2 k1 z
increased until 150 % of the rated voltage, current or power is reached. The voltage or the2 n* q+ }+ x2 j @& j4 p1 {
current shall be increased until 150 % of the rated power is reached. The test shall be
5 {/ u$ i9 w; ?, Y" o L1 lcontinued until the LED module is thermally stabilised. A stable condition is reached, if the
# h8 Y9 i% m6 |' _& Qtemperature does not change by more than 5 K in 1 h. The temperature shall be measured in
- {/ S* \, `; Y' bthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the
2 l' }" t: [- z7 r4 J. wtime period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
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, l( P a( a7 [ `# |# R, `If the module contains an automatic protective device or circuit which limits the power, it is' R" f @6 v" G0 x* d' f5 I
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power0 o3 d: q% R9 q4 H9 K
over this period, the module has passed the test, provided the compliance (4.1 and last: _& I1 @/ ~) O- _0 d( n
paragraph of 13.2) is fulfilled.+ z! N6 G7 H5 P% Q& u" B
After finalising the overpower mode, the module is operated under normal conditions until% H+ x3 M7 D& i4 q. y. g
thermally being stable.
+ V7 z# p% }8 w }! NA module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
# J+ E' v5 l; _& M! d( h) Noverpower condition has been withstood. To check whether molten material might present a& J6 ]* f+ S6 P- K% B
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module) Q' G9 b8 k% c* r/ R
shall not ignite. |
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