我该选多大尺寸的LED筒灯？规格匹配指南
定义: 流明（lm）衡量光源的总可见光输出。勒克斯（lx）衡量到达表面的实际照度——1 lux = 1 流明/平方米。
适用标准: IES LM-79-19. LED筒灯尺寸选择取决于开孔直径。标准2.5寸(75mm)适合小空间，4-6寸(100-150mm)适合客厅
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