L/B is the standard definition of LED lamp life.

50000h (L85 / B10), that is, 10% of the product luminous flux output to the initial value of 85% or less when the time is 50,000 hours.
In turn, it means that LED products with 50,000 hours after the work, there are still 90% of the product light failure less than 15% reliability.

50000h (L80 / B50), that is, 50% of the product luminous flux output to the initial value of 80% or less when the time is 50,000 hours. Refers to the LED lamps work 50,000 hours later, there are still 50% of the product light fades less than 20%.

In general, to achieve this indicator of LED lamps, you must use world-class LED chip, the use of higher thermal design, 25 ° C ambient conditions, LED lamp chip junction temperature control within 60 ° C can be done.
6inch Recessed Downlight

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