1. 顺偏特性：当直流电有了足够的正电压的时候，LED的电流就快速的上升，而这个通入的电流就称为「顺偏电流」，而LED两端的电压就被称为「顺偏电压」。若电压的范围忽高忽低即表示质量异常，而通常波长越短的LED其电压会越高。
1. Shun partial characteristics: when there are enough positive voltage in DC, led to the current rapid rise, and the pass into the current is called "Shun bias current, and the voltage at both ends of the LED is called" bias ". If the range of the voltage is high and the voltage is abnormally high, the LED of the shorter wavelength is higher.
2. 逆偏特性：顾名思义就是给予LED负的电压，也称为「漏电压」，一般而言，不同的济南广告大字材料会各自有其合理的电压值，而造成逆电压特性不良的原因是静电放电，这个特性也可以用来评估此LED的质量。
2. The inverse partial characteristics: as the name suggests is to give such a negative voltage, also known as the "drain voltage", in general, different Jinan advertising characters materials will each have its reasonable voltage value, resulting in inverse voltage undesirable properties due to electrostatic discharge, this feature can also be used to evaluate the quality of the LED.
3. 闸流体效应：LED的主要材料是pn接面，而闸流体是电子电力常用的控制组件，当它的厚度不均匀的时候就会有pn层面交错的情形产生，此时的电压差就会有很大的差异，这就是「闸流体效应」，而若电压差太大的话就显示此产品的质量不太好，所以这也可以用来衡量LED的质量。
3. Brake fluid effect: led the main material is PN junction, and brake fluid is power electronic common control components, when its thickness is not uniform when there will be interleaved PN level. At this time of the voltage difference will have great differences, this is the "brake fluid effect", and when the voltage difference too big shows the quality of this product is not very good, so it can also be used to measure such quality.
4. 产生光谱：藉由外在环境的能量提供而使得LED含有的元素产生了能阶的转移，正因为吸收能量而使的能阶提升到激发态(能量较高的能阶)，往往反应都会趋向能量较低的地方跑，所以它就回到了基态能阶，而吸收的能量就转换为光子，能量也正好落在可见光区，使得肉眼可以看的到，而产生光谱。
4. A spectrum: by the energy of the external environment to provide the LEDs contain elements can order the transfer, because of energy absorption and make to order up to (higher energy level) of excited state often reaction tends to lower energy place to run, so it went back into the ground state energy order, energy absorption and conversion for the photon energy falls in the range of visible light, to the naked eye can see, arising from the spectra.
5. 光指向性：LED为光源之一种，所以就有发光光束的方向-即空间中各角度的相对强度值。
5 light directional: LED is one of the light source, so there is the direction of the light beam - that is, the relative intensity of each angle in the space.
