Back Light: In the three-point lighting system, the source of illumination placed behind and above the actor. Its main function is to cast light on the actor's head and shoulders, creating an outline of light around the actor to distinguish him or her from the background.

 

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Back Light: In receivers, a display may be lit from the rear to create better visibility under a wide range of ambient light conditions.

Three-Point Lighting: An aesthetic convention in which an actor or object is lit from three sources or points of light of varying intensity. There is one main source of illumination (key light), one source fillin . . . View Full Definition

Light-Tight: Term denoting a material or piece of equipment that is impervious to light.

Lighten Up: Selling some part of a stock or bond position in a portfolio to realize capital gains or to losses or increase cash assets.

Lightbox: Box of fluorescent tubes balanced for white light and covered with translucent glass or plastic. Used for viewing, registering or correcting film negatives and positives.

Lighter-Than-Air Craft (LTAC): Generally referring to powered blimps and dirigibles, but often also includes free balloons.

Lightfast: A pigments resistance to fading on long exposure to sunlight. Watercolors are rated lightfast on a scale of I-IV. I and II ratings are the most permanent.

Lighting Color: Light may be 'colored' by placing a filter or gelatin in front of a light source.

Lighting: The placement, type, direction, and brightness or dimness of lights used on stage. Often lighting can establish mood, highlight specific characters, actions, or scenes, or serve symbolic purposes.

Lightfastness: No loss of color due to exposure to light, heat or weathering.