Why does the LED band suddenly go dark?
First of all, the power is battery, then please look at the battery, there is no electricity
Service condition problem:1, LED for constant current drive, there are some LED voltage driver, cause LED attenuation.2 、 the driving current is larger than the rated driving condition.In fact, there are many reasons leading to degradation of LED products, the key is the heat problem, although many manufacturers in the secondary products do not pay special attention to the heat problem, but the long-term use of these secondary LED products, attenuation degree will be higher than a focus on cooling LED products. The LED chip itself, thermal resistance of silver colloid influence, substrate cooling effect, and also with colloidal gold and light attenuation relationship.
LED product quality problems:1, the use of LED chip poor physique, brightness attenuation faster.2, the production process defects, LED chip heat dissipation can not be derived from the PIN pin, resulting in LED chip temperature is too high, chip attenuation intensified.
If the external power supply, considering the light attenuation, is mainly determined by the LED chip.LED decay refers to LED after a period of time after the light, the light intensity will be lower than the original light intensity, while the low part is the LED light failure. General LED packaging manufacturers to do the test is under laboratory conditions (25 C under normal temperature), to 20MA DC to LED1000 hours of continuous light intensity before and after the light contrast.
