n. 光明, 光辉, 光度, 亮度

[计] 亮度

[化] 发光度

[医] 发光度, 明度

[ noun ]
the quality of being luminous; emitting or reflecting light
<noun.attribute>
its luminosity is measured relative to that of our sun

Luminosity \Lu`mi*nos"i*ty\, n.
The quality or state of being luminous; luminousness.