LED thermal indicators

1, the difference in temperature between thermal resistance Rth hot flow channel and channel on the ratio of dissipation power; In LED to light up after heat conduction steady state, the chip's surface per 1 W power dissipation, chip of pn junction temperature of the bracket or aluminum plate connected with temperature difference between the temperature is called thermal resistance Rth, units for ℃ / W. The lower numerical, said the heat conduction to the frame or aluminum substrate the faster.

2, LED the storage environment temperature and working temperature

routine, LED the storage environment temperature should be in - 40℃~+100℃。 The encapsulation of LED, sometimes in order to make the packaging or phosphor quick-drying glue, keep the temperature of 150 ℃ for 1 to 2 hours, it is influential to the LED, remains to be proven. While leds - is the work temperature 30 ℃ ~ + 80 ℃, but working temperature with thermal resistance. LED at work, it is best to its pn junction temperature below 100 ℃.

3, anti-static index

LED device should pay attention to esd. Whether in the transport state, or in the process of assembly, are brought about by the electrostatic damage may occur, pay special attention to esd. Generally LED to do after, bipolar open anti-static index should be within the 500 v. Failure rates lambda

4, lambda failure rate refers to a group of LED devices in light after how long, how many 'dead lamp' phenomenon. This is the key indicators of quality of this batch of LED devices. If work 10 hours no 'dead lamp' phenomenon appears, explain failure rate is good, the failure rate is 0.

5, life LED device under normal working conditions, half light failure, the longer that LED the longer life. According to the theoretical calculation of up to 100000 hours. But at the moment due to reasons such as material, manufacturing technology, the market of LED device life can reach 2 ~ 30000 hours. LED the life of the device and the system when using the cooling conditions, the luminous efficiency has a direct relationship.

6, other indicators

the LED is plastic encapsulated by epoxy resin and so on. Because of time and chemical action, can make the encapsulation adhesive pervious to light quality becomes poor. Sometimes make colloid yellow feculence, pervious to light; Some will make the glue vitrified and broken. These changes will make the LED device performance, so short of the original technical indicators, which affects its out of light efficiency and service life.

Sophy

China lighting network