Knowledge base

Isocandela line

An isocandela line is a graphical representation of the light intensity (candela) in different directions around a light source or fixture. It...

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Stevens effect

The Stevens effect describes the phenomenon whereby perceived contrast increases as the brightness of the environment increases . This means that dark...

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Hunt effect

The Hunt effect describes the phenomenon where colors appear more vibrant and saturated as brightness increases . This effect occurs in both...

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Foot lambert (foot-lambert, abbreviated fL)

A foot-lambert (abbreviated fL) is a non-SI unit of luminance , or the brightness of a surface that emits or reflects light....

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Coefficient of Utilization (CU)

The Coefficient of Utilization (CU) is a measure in lighting design that indicates how efficiently a lighting system uses the light it...

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Ceiling Cavity Ratio (CCR)

The Ceiling Cavity Ratio (CCR) is a measurement in lighting design that describes the ratio of the ceiling to the fixtures ....

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Room Cavity Ratio (RCR)

The Room Cavity Ratio (RCR) is a measurement in lighting design that describes the relationship between the height, width, and length of...

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Floor Cavity Ratio (FCR)

The Floor Cavity Ratio (FCR) is a measurement in lighting design that describes the geometric relationship between the floor and surrounding surfaces...

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Gobo projector

A gobo projector is a lighting fixture that projects a pattern, image, or text using a gobo (a template with a cut-out...

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PC spot (Plano Convex spot)

A PC spotlight (Plano Convex spotlight) is a focused theatrical light with a single plano-convex lens . This type of lamp is...

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Theater lighting

Theatrical lighting encompasses all lighting used to enhance plays, concerts, operas, and other stage productions . Its purpose is to enhance the...

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Elliptical Reflector Spot (ERS)

An Ellipsoidal Reflector Spotlight (ERS) , also known as an Ellipsoidal Reflector Spotlight , is a focused theatrical light that produces a...

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