请问下大神们 灯具的rating L和B是什么等级 LED三防灯和面板灯

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Q:大家早 请问下大神们 灯具的rating L 和B 是什么等级
" N4 k- R3 S& VA:什么产品？
Q: LED三防灯和面板灯
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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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