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What does L70 B10 mean about led light?

What does "L70 B10" mean about led light?

L70 refers to lumen depreciation to 70% of initial lumen output; stated conversely, it indicates 70% lumen

maintenance. “B” specs add a target statistical confidence interval. Thus, B50 indicates no more than 50%

of a sample of LED devices would be expected to have their light output drop below a target lumen

maintenance level. B10 would mean no more than 10% of the sample met that L standard within the given time.
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