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　1.正向作業電流If：
1. forward working current If:
它是指發光二極體正常發光時的正向電流值。在實際使用中應依據需求挑選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.正向作業電壓VF：
2. forward operating voltage VF:
參數表中給出的作業電壓是在給定的正向電流下得到的。通常是在IF=20mA時測得的。發光二極體正向作業電壓VF在1.4～3V。在外界溫度升高時，VF將下降。
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. As the outside temperature rises, the VF will fall.
3.V-I特性：
3.V-I characteristics:
發光二極體的電壓與電流的關係，在正向電壓正小于某一值(叫閾值)時，電流極小，不發光。當電壓超越某一值后，正向電流隨電壓敏捷增加，發光。
The relationship between the voltage and the 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, and the light is shining.
4.發光強度IV：
4. luminous intensity IV:
發光二極體的發光強度通常是指法線(對圓柱形發光管是指其軸線)方向上的發光強度。若在該方向上輻射強度為(1/683)W/sr時，則發光1坎德拉(符號為cd)。因為通常LED的發光二強度小，所以發光強度常用燭光(坎德拉, mcd)作單位。
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 the LED is usually two, the intensity of the luminescence is usually used as a unit of candle power (Candela, MCD).
5.LED的發光視點：
The luminous viewpoint of 5.LED:
-90°- +90°
-90 degrees +90 degrees
6.光譜半寬度Δλ:
6. spectral half width lambda:
它表明發光管的光譜純度。
It shows the spectral purity of the light emitting tube.
7.半值角θ1/2和視角：
7. half value angle theta 1/2 and angle of view:
θ1/2是指發光強度值為軸向強度值一半的方向與發光軸向(法向)的夾角。
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.:
依據LED發光立體角換算出的視點，也叫平面角。
According to the LED light solid angle conversion point of view, also known as plane angle.
9.視角：
9. angle of view:
指LED發光的最大視點，依據視角不同，應用也不同，也叫光強角。
The maximum point of view of LED light, depending on the angle of view, the application is also different, also known as the intensity angle.
10.半形：
10. half shape:
法向0°與最大發光強度值/2之間的夾角。嚴厲上來說，是最大發光強度值與最大發光強度值/2所對應的夾角。
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.
LED的封裝技術致使最大發光視點并不是法向0°的光強值，引入誤差角，指得是最大發光強度對應的視點與法向0°之間的夾角。
The encapsulation technology of LED makes the maximum luminous viewpoint not equal to the light intensity of 0 degrees. The angle of error is introduced as the angle between the viewpoint of the maximum luminous intensity and the normal angle of 0 degrees.
11.最大正向直流電流IFm：
11. maximum forward DC current IFm:
答應加的最大的正向直流電流。超越此值可損壞二極體。
Maximum positive forward current allowed to be added. Beyond this value, diodes can be damaged.
12.最大反向電壓VRm：
12. maximum reverse voltage VRm:
所答應加的最大反向電壓。超越此值，發光二極體也許被擊穿損壞。
Maximum reverse voltage allowed. Beyond this value, the light emitting diode may be damaged by breakdown.
13.作業環境topm:
13. job environment topm:
發光二極體可正常作業的環境溫度規模。低于或高于此溫度規模，發光二極體將不能正常作業，功率大大下降。
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 power will be greatly reduced.
14.允許功耗Pm:
14. allow power dissipation Pm:
答應加于LED兩頭正向直流電壓與流過它的電流之積的最大值。超越此值，LED發熱、損壞。
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.

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