短語詞組短語luminous s flux 光通量Luminous Flux 光通量luminous flux maintenance 光通維持率;光通量維持率led luminous flux 光通量lamp luminous flux 光通量minimum luminous flux 最小光通量density of luminous flux 光通量密度High luminous flux 光通量高direct luminous flux 直接光通量 返回 luminous flux