High quality LEDS
Identify a lamp is good or bad depends on the precise test equipment to test the lamp beads of various parameters, such as the brightness of the lamp beads, lamp beads or color temperature is concentrated, the lamp light efficiency, angle and other parameters! From these parameters, we can determine a company's lamp production capacity, control in color temperature, chip and other aspects!
If there is no auxiliary instrument, you can only look at the appearance of the surface from the surface:
1, check the colloid in the presence of stain impurities
2, check the colloidal presence of air bubbles
3, view the lamp pin material