lumen

/loo-muhn/US // ˈlu mən //UK // (ˈluːmɪn) //

流明,腔体,流明度,内腔

Definitions

n.名词 noun

1
plural lu·mens, lu·mi·na [loo-muh-nuh]. /ˈlu mə nə/.
- : Optics. the unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity. Abbreviation: lm
- : Anatomy. the canal, duct, or cavity of a tubular organ.
- : Botany. the cavity that the cell walls enclose.

That’s why it’s best to look at the lumens instead of the wattage.
Besides lumens, the biggest factor for finding the best floodlight is position.
The number of lumens needed for an outdoor floodlight is between 700 and 2,5000.
Be sure to pay attention to the lumens or wattage of a light fixture – no dimly lit spaces here.
For huge spacesA junk-drawer flashlight’s brightness measures in the hundreds of lumens.
That reminds me, I'd better arrange a debate on immigration for the Lumen.
"She made a splendid impression on the Lumen," Colburn went on.
In the second main variety of gland the secretory portion is enlarged and the lumen variously increased in size.
At about the time when a lumen appears in the Oviduct the first traces of the Wolffian duct become visible.
While undergoing this change of position it also acquires a lumen, but ends blindly both in front and behind.