Google's Gmail Web-based email service runs on the Internet Message Access Protocol system, but it also offers Post Office Protocol mail server access.
Definition of LUMEN. 1. 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.
A lumen is simply a unit of measurement of visible light. When shopping for newer, energy-efficient LED light bulbs, understanding light output in lumens is essential. Not surprisingly, more lumens equals more brightness.