Lumen

[Jessica]

1 : the cavity of a tubular organ or part the lumen of a blood vessel
2 : the bore of a tube (as of a hollow needle or [catheter])
3 : a unit of [luminous] [flux] equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity

[Tanya Shivari]

An empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically it is the luminous flux emitted with a solid angle (1 steradian) by a point source having a uniform luminous intensity of 1 candela.

[Sarah]

Lumen helps you find anything, anywhere in your data, with one click. Turn any search into a chart or graph. Close cases, save time. A software product by Numerica