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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
" U) c; S, u5 x7 J( Z( _" t. N& g0 Sincreased until 150 % of the rated voltage, current or power is reached. The voltage or the
2 f7 {" c; u5 pcurrent shall be increased until 150 % of the rated power is reached. The test shall be% S6 Z2 p# N# y9 ] M* @
continued until the LED module is thermally stabilised. A stable condition is reached, if the
+ b' }' Y& J, B; E6 \temperature does not change by more than 5 K in 1 h. The temperature shall be measured in
1 f$ ?6 _* K, b$ z6 G+ wthe tc point. The LED module shall withstand the overpower condition for at least 15 min, the" |; s& T7 f. [- T5 b2 S6 V3 ]
time period of which can lie within the stabilisation period if the temperature change is ≤ 5K.
" Y* I) X& i& ?( X1 w% y; ?; Z7 U2 f7 z7 U& @& p9 W) b
If the module contains an automatic protective device or circuit which limits the power, it is0 l: _) c) S: S7 e) s
subjected to a 15 min operation at this limit. If the device or circuit effectively limits the power
, D7 }- L$ `: x) zover this period, the module has passed the test, provided the compliance (4.1 and last: h& P: i Z) I7 Q3 N
paragraph of 13.2) is fulfilled.- S) ]# a+ J/ p! ~9 P
After finalising the overpower mode, the module is operated under normal conditions until
6 u* ~, Z. @9 \+ n6 J/ hthermally being stable.
0 _% K) A m/ F4 O$ v( \, _A module fails safe if no fire, smoke or flammable gas is produced and if the 15 min
: @! b2 P6 ^% E+ A4 poverpower condition has been withstood. To check whether molten material might present a( [ [% ^" ~" o$ e( k% [9 G
safety hazard, a tissue paper, as specified in 4.187 of ISO 4046-4, spread below the module% C A0 G; `& B5 A5 m
shall not ignite. |
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