In other words, by giving the blue LEDs 10 mA of current, CCDL can extend their half life to match that of the green LEDs. Therefore, by controlling the current passing throught the LEDs, CCDL conservatively estimates an average life span of 200,000 hours of Nichia LEDs used in our products. Because the screen can be dimmed at nighttime, less current will pass through the LEDs, thereby increasing their life span. In each pixel that is lit, not every color in it is lit. This consideration also increases the half life of the LEDs in the display.
Airborne particles leave dirt on the surface of the LEDs which decreases their brightness.