| Usage: | Auto Testing Machine |
|---|---|
| Power: | Electronic |
| Model Number: | LEDLM-80PL |
| Brand Name: | LISUN |
| Place of Origin: | China (Mainland) |
Quick Details
Specifications
LEDLM-80PL Life Testing Machine - acceleration led lumen maintenance test system Introduction:
|
Item |
Optical decay rate |
L50(h) |
L30(h) |
|
85°C |
8% |
8312.950414 |
4277.62127 |
|
70°C |
3% |
22756.57306 |
11709.922 |
The temperature Tj (the contact surface temperature between LED and circuit board, or ambient temperature providing the heat-sink is complete, but the junction temperature will be 15°C higher than ambient temperature in 350mA) will greatly affect the test result. We can predict the LED life under varies temperature according to formula 2. Suppose the time t1 is the LED life under T1 temperature, time t2 is the LED life under T2 temperature, then we can calculate the time t3 under T3 temperature:
t3=t1*exp{(ln(t2/t1)/[1/(T2+15+273)-1/(T1+15+273)] * [1/(T3+15+273)-1/(T1+15+273)]}
Then we can get the time to 50% and 30% lumen maintenance under different temperature:
|
Item |
Tj=85°C (h) |
Tj =70°C (h) |
Tj =50°C(h) |
Tj =25°C(h) |
|
L50 |
8312.950414 |
22756.57306 |
100144.3113 |
833055.6622 |
|
L30 |
4277.62127 |
11709.922 |
51531.576 |
428668.0953 |
Base on this model and combine the standards of IESNA LM-80-2008, LM-82, TM-21 and GB/T, Lisun develop the LISUN LED-80P SYSTEM. This system consist by high and low temperature chamber, AC power supply, DC power supply, multiplex temperature meter, photometer, 2m optical fiber, optical fiber and detector conversion device, light decay prediction software and 19 inch cabinet.