[Er.sandeep jain]

L70 is the life expectancy of the LEDs. When LED manufacturers project a “40,000 hour life” it is based on when an LED source diminishes light output down to a 70% light level, compared to its initial lumen output.  For example if an LED starts illuminating at 100 lumens and after 40,000 hours it only emits 70 lumens (70% of the original output) then the L70 estimated life of this LED is 40,000 hours.