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
) T: g# t& h  r2 kA:什么产品？
4 m! w( u0 {2 R0 r& h8 T) c2 [5 I+ o8 kQ: LED三防灯和面板灯
0 d. i! Z+ Q& k& y* e( jA: L和B就是L70 / B50测试
" k+ i2 a! c5 C+ ?" W3 Y% t" \# _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.