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For example, in the off-line low-power LED lighting applications, a common power supply topology is isolated fly back topology. To comply with the "Energy Star" solid-state lighting standards 8W Offline LED Driver Green Point ® reference design, for example, due to the LED String Light fly back regulator sine square wave power converter does not provide a constant bias to the primary energy, Dynamic Self-Supply (DSS ) circuit may activate and trigger light flashes. To avoid this problem, the primary bias must be discharged in the portion of LED Flashlight each half cycle, and accordingly, it need to select the appropriate capacitor and resistor values which constitute a bias circuit. Further, even with the LED driver applications which provides excellent power factor correction, support TRIAC dimming, it an also require electromagnetic interference (EMI) filter. anty881209wong 140512 Transient current cause by the TRIAC (step) will motivate the natural resonant that on the EMI filter inductor and capacitor. If this resonance LED bulb characteristics cause the input current is reduced to maintain under current TRIAC, TRIAC will be closed. After a short delay, TRIAC usually will conduct and inspire the same resonance. Within a half cycle of the waveform of the Input power, this series of events may be repeated multiple times, thereby forming a visible LED flashes. To address this problem, a key requirement of the TRIAC dimming is that the input capacitance of EMI filter is very low, and these LED Tube decoupling capacitors is able to through the TRIAC and winding impedance. According to the formula, if the dimming module capacitance decreases, then it is possible to increase the resistance of the resonant circuit, in principle, oscillation is suppressed, the desired recovery circuit. Damage reason of LED lightLED light now are become more and more popular and many house owners like to install the LED lights that with LED car light various design and features. But it is not an easy thing to make your LED light works well. Even though it is more endurable than the other kind light, there is also something you need to know when it broke up. 1. Current voltage is instable, caused by the increased supply voltage; LED lights are particularly vulnerable to destroy. There are many reasons that cause a LED Ceiling Light sudden increase in voltage, such as power quality problems, users make improper use or other reasons, causing the power supply voltage suddenly rose high. 2. The partial short-circuit of the lamp supply passage. This situation is usually the short-circuit on a part of the line or the other conductors which make the voltage increased. 3. LED may be damaged because of their quality reasons that resulting in a short circuit, the voltage drop on its original passed on to other LED.