The light meter inside your camera assumes your scene has an overall average brightness of 18%
A tool used to gauge light output is a light meter. In order to get the right exposure for a shot, a light meter—more precisely, an exposure meter—is employed. Given a specific lighting scenario and film speed, the metre will either have a digital or analogue calculator that displays the appropriate shutter speed and f-number for the best exposure. In a similar way, exposure metres are also employed in the domains of scenic design and filmmaking to establish the ideal lighting level for a scene.
Light metres are used in the broader field of architectural lighting design to analyse the light requirements for growing plants as well as to ensure that a building lighting system has been installed and is functioning properly.
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