Except individual LED chips, LED Lights packaging and LED power supply can impact significant influence on their capacities, brightness and color. We defined them as internal factors. External factors are mainly from circuits and other electronic components. Since working temperatures, current, circuit construction, voltage peak can also affect the performance of LED chips. Proper circuit design and assembly is the key to protect the LEDs and ensure their performance. During the packaging process, even different assemblers with different working experience will cause the non-uniformity.
With the rapid development of LED demand, the global-oriented LED chip suppliers and packaging factories are booming simultaneously. Unfortunately, the over-booming trend made many manufacturers choose to use low quality LED chips to reduce cost. Besides, their LED packaging designers and engineers are usually lacking of working experience. Most OEM producers have no capability to establish their own LED chips sections. Replying on other LED chip suppliers is their single solution. Experienced producers know how to choose right suppliers and also conduct a series of testing for LED packaging and circuit structure.
In order to eliminate the injustice during the testing, many companies chose to employ a third party to test the quality of LED street light chips. In the period of testing, randomly chosen LED chips will be gathered together into some specific testing rooms. These LED chips will be continuously working for several weeks in the harsh conditions, including pressure test, temperature test, fixed/flexible voltage test, fixed/flexible current test, etc. A large amount of data should be recorded before and after the testing. The three major parameters of LED: light intensity, color, potential drop should keep in record during the entire testing process. Only high quality LED chips can survive from it.
Accelerated life cycle testing is a key point to avoid failure in special applications. This test can help eliminating those LED chips which has an estimated service life more than 100000 hours but will be failed after 1000 hours work. This happens often. The light intensity of low quality LED chips (or high quality LED chips with unreasonable assembling) will drop dramatically after 1000 hours work. In fact, low quality LED tubes chips using higher driving current are more brightness than high quality LED chips in the early stage of service. However, continuously working in high temperature may cause huge damages to them.