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

ledpan

Q:大家早 请问下大神们 灯具的rating L 和B 是什么等级
A:什么产品？
$ y. }6 R# Z. h1 _% T7 ?& ~0 hQ: LED三防灯和面板灯
A: L和B就是L70 / B50测试
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.