lumina

详细解释:腔, 流明(光通量单位)
【医】 腔, 流明(光通量单位)

英语解释：

名词 lumen:

a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions同义词：lumen, lm