The general level of light, or background light, in a given environment. The ambient light level is the sum of all light (direct and indirect) in a given area emitted by natural and manmade sources at a given time. It can affect the legibility of signs, and may require alterations in illumination methods.
surrounding or environmental light that is everywhere equally intense and has no directionality
A pervasive background light source with no particular source location or direction. Ambient light appears to come from everywhere at the same time, like sunlight on a hazy day. Ambient light is typically used to control the overall brightness and color of a scene. Use an ambient light to simulate a combination of direct light (for example, the sun or a lamp) and indirect light (sunlight diffused by the atmosphere, or lamp light reflected off the walls of a room). See light source.