An exposure meter (generally hand held as opposed to a reflective meter that is built into a camera) that reads the amount of incident light. Since the meter does not read the light reflected from the subject, the subject s reflectance does not affect the exposure reading. Incident light meters are equipped with one of two types of light receptor diffusion cover - a round diffuser for three-dimensional subjects and a flat one for two-dimensional, flat subjects, such as a map or painting. Also called an Ambient light meter.Photo Tips
Light falling on a surface - not the light reflected from it. Incident light rays are those that strike an object.
The light that falls on a subject, rather than that which is reflected off it. Many handheld meters are of the incident light reading type. Incident readings are made from the subject with the meter pointed back at the camera.
Light rays that fall upon the surface of a body.
Light that falls on a surface and is not reflected by it. An incident light meter would be used to measure this for proper exposure settings.
The light that makes it to the scene after roughly 82% of it is Absorbed and Scattered.