1.正向作业电流If：
1. forward working current If:
它是指发光二极体正常发光时的正向电流值。在实际使用中应依据需求挑选IF在0.6·IFm以下。
It refers to the positive current value when the LEDs emit normal light. In actual use, IF should be selected below 0.6. IFm in accordance with requirements.
2.正向作业电压VF：
2. forward operating voltage VF:
参数表中给出的作业电压是在给定的正向电流下得到的。通常是在IF=20mA时测得的。发光二极体正向作业电压VF在1.4～3V。在外界温度添加时，VF将下降。
The operating voltage given in the parameter table is obtained at a given forward current. Usually measured at IF=20mA. The positive working voltage of LEDs is VF at 1.4 ~ 3V. When the ambient temperature is added, the VF will fall.
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3.V-I特性：
3.V-I characteristics:
发光二极体的电压与电流的联系，在正向电压正小于某一值(叫阈值)时，电流极小，不发光。当电压超越某一值后，正向电流随电压敏捷添加，发光。
The relation between the voltage and current of a light emitting diode. When the forward voltage is less than a certain value (called threshold), the current is very small and does not emit light. When the voltage exceeds a certain value, the forward current increases rapidly with the voltage.
4.发光强度IV：
4. luminous intensity IV:
发光二极体的发光强度通常是指法线(对圆柱形发光管是指其轴线)方向上的发光强度。若在该方向上辐射强度为(1/683)W/sr时，则发光1坎德拉(符号为cd)。因为通常LED的发光二极管强度小，所以发光强度常用烛光(坎德拉, mcd)作单位。
The luminous intensity of a light emitting diode is usually the intensity of the light in the direction of the fingering line (to the cylindrical tube). If the radiation intensity in this direction is (1/683) W/sr, the light is 1 Candela (symbol CD). Because the intensity of light emitting diodes in LED is usually small, the intensity of illumination is usually used as a unit of candle power (Candela, MCD).
5.LED的发光视点：
The luminous viewpoint of 5.LED:
-90°- +90°
-90 degrees +90 degrees
6.光谱半宽度Δλ:
6. spectral half width lambda:
它表明发光管的光谱纯度。
It shows the spectral purity of the light emitting tube.
7.半值角θ1/2和视角：
7. half value angle theta 1/2 and angle of view:
θ1/2是指发光强度值为轴向强度值一半的方向与发光轴向(法向)的夹角。
Theta 1/2 refers to the angle of the luminous intensity value in the direction of half the axial intensity and the axial (normal) direction of the light emitting.
8.全形：
8.:
依据LED发光立体角换算出的视点，也叫平面角。
According to the LED light solid angle conversion point of view, also known as plane angle.
9.视角：
9. angle of view:
指LED发光的最大视点，依据视角不一样，使用也不一样，也叫光强角。
Refers to the maximum view of LED light emitting, depending on the angle of view, the use is not the same, also known as light intensity angle.
10.半形：
10. half shape:
法向0°与最大发光强度值/2之间的夹角。严厉上来说，是最大发光强度值与最大发光强度值/2所对应的夹角。LED的封装技术致使最大发光视点并不是法向0°的光强值，引入偏差角，指得是最大发光强度对应的视点与法向0°之间的夹角。
The included angle between normal 0 degree and maximum luminous intensity value /2. Strictly speaking, the maximum luminous intensity value is corresponding to the maximum luminous intensity value /2. The encapsulation technology of LED makes the maximum luminous viewpoint not equal to the light intensity value of 0 degrees. The angle of deviation is introduced as the angle between the viewpoint of the maximum luminous intensity and the normal 0 degrees.
11.最大正向直流电流IFm：
11. maximum forward DC current IFm:
答应加的最大的正向直流电流。超越此值可损坏二极体。
Maximum positive forward current allowed to be added. Beyond this value, diodes can be damaged.
12.最大反向电压VRm：
12. maximum reverse voltage VRm:
所答应加的最大反向电压即击穿电压。超越此值，发光二极体可能被击穿损坏。
The maximum reverse voltage promised is the breakdown voltage. Beyond this value, the light emitting diode may be damaged by breakdown.
13.作业环境topm:
13. job environment topm:
发光二极体可正常作业的环境温度规模。低于或高于此温度规模，发光二极体将不能正常作业，效率大大下降。
The ambient temperature scale of a light emitting diode for normal operation. Below or above the scale of this temperature, the light emitting diode will not work properly and the efficiency will be greatly reduced.
14.答应功耗Pm:
14. promise power consumption Pm:
答应加于LED两头正向直流电压与流过它的电流之积的最大值。超越此值，LED发热、损坏。
The maximum value of the product of the positive DC voltage and the current flowing through the LED that is allowed to be applied to both ends. Beyond this value, LED is hot and damaged.