parameters in LED

Publié le par er86

The important parameters in LED
1 forward current If: it refers to the light emitting diode forward current value when the normal light. LED Tube Light ManufacturerIn actual use should be selected according to the needs of IF in 0.6 IFm the following.
The 2 positive voltage VF: parameters are given in the table working voltage is given in the forward current under. Generally in the IF = 20mA measured. Light emitting diode forward voltage in the range of 1.4 ~ 3V VF. In the outside world when the temperature rises, the VF will drop.
The characteristics of 3.V-I: led the relationship between voltage and current, the forward voltage is smaller than a certain value ( called threshold ), current is small, no light. When the voltage exceeds a certain value, the forward current with voltage increases rapidly, led.
4 luminous intensity IV:
LED luminous intensity is usually fingering line ( on cylindrical luminous tube refers to the axis direction of the luminous intensity ). If in the direction of radiation intensity ( 1 / 683) W / Sr, then led 1 candela ( symbol CD ). Because of the general LED luminous intensity of the two small,LED Strip Light Manufacturerso the common candle ( light intensity candela, MCD ) as unit.
5.LED light emitting angle: - 90 degrees to + 90 degrees
6 spectral half width delta lambda : it expresses the spectral purity of the luminous tube.
7 half value angle theta 1 / 2 and 1 / 2 : from the perspective of theta is a luminous intensity value of axial intensity values of half of the direction and luminous axial ( normal ) angle.
8: according to the whole LED light-emitting solid angle conversion of angle, also called plane angle.
The 9 perspective: refers to the LED luminescence maximum angle, according to the angle of view is different, different application, also called light angle.
10 half form: normal 0 degrees and the maximum luminous intensity values / 2 angle between. Strictly speaking, is the maximum luminous intensity value and the maximum luminous intensity values corresponding to the angle / 2. LED encapsulation technology resulted in the largest emitting angle is not the normal 0 degree light intensity value,LED Spot Light Manufacturer introducing the angle of deviation, mean maximum luminous intensity corresponding to 0 DEG angle and the angle between the.
11 maximum DC forward current IFm: allowed maximum DC forward current. More than this value can be damaged diode.
Maximum reverse voltage 12 VRm: allows the maximum reverse voltage. This value is exceeded, light emitting diode may be breakdown.
13 work environment TOPM: light emitting diode working environment temperature range. Below or above this temperature range, light emitting diode will not work, greatly reduce the efficiency of.
14 allows power Pm: allows to LED ends of positive DC voltage and the current through it is the product of the maximum. This value is exceeded, a LED heating,led lighting design

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