LIGHT+VOCABULARY

** Accent Lighting ** Directional lighting to emphasize a particular object or draw attention to a display item. ** Ambient Lighting ** The general lighting present in an area --excluding task lighting and accent lighting but including general lighting and daylight streaming in. ** Black Light ** A popular term referring to a light source emitting mostly near UV (320 to 400 nm) and very little visible light. ** Brightness ** Brightness can refer to any of several technical terms used in lighting and is, therefore, ambiguous (See [|LUMINANCE]  ). ** Fluorescence ** A physical phenomenon whereby an atom of a material absorbs a photon of light an immediately emits a photon of longer wavelength. If there is a significant delay the phenomenon is called phosphorescence rather than fluorescence. It is interesting that "phosphors" used in lamps exhibit "fluorescence," not "phosphorescence." (See [|PHOSPHOR]  ) ** Illuminance ** The "density" of light (lumens/area) incident on a surface; i.e. the light level on a surface. Illuminance is measured in [|footcandles]  or  [|lux]. The method of lighting a space by directing the light from luminaires upwards towards the ceiling. The light scattered off the ceiling produces a soft, diffuse illumination for the entire area Radiant energy that can be sensed or seen by the human eye. Visible light is measured in [|lumens]. ** Reflectance ** The ratio of light reflected from a surface to that incident upon it.
 * Indirect Lighting **
 * Light **