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-
Generally,
a term for light or lighting.
- In photometry,
the amount of light, i.e., luminous flux per unit area incident
on a surface, in Footcandles or Lux
Incandescent
A term used to describe a lamp, or a luminaire that utilizes such
a lamp, that employs the incandescence of a filament as its light
source. Such a lamp was first developed by Thomas Edison (United
States) and Joseph Swan (Great Britain), independently, in 1879.
Indirect Lighting
Illumination that falls on an area or subject by reflection, e.g.
bounce lighting.
Infrared (IR)
- A
reference to anything that uses or emits infrared radiation.
- Electromagnetic
radiation having a wavelength longer than visible red light but
shorter than microwaves, i.e. approximately 750mm to 1mm.
Infrared
Light (IR Light)
Although not actually light, this is a commonly used term for Infrared
Radiation.
Infrared Radiation (IR Radiation)
Electromagnetic energy in the form of heat, generally an unwanted
by-product of light.
Inky
A small fresnel spotlight with a 1.5" to 3" lens diameter,
usually 100-250 watts.
Inky Dink
See the definition for Inky.
Instant Restart
See the definition for Hot Restrike.
Instant Restrike
See the definition for Hot Restrike.
Intensity (Light Output)
The “strength” of the incident-light source, independent
of the subject’s reflectivity.
Inverse Square Law
An equation relating the intensity of a source to the illumination
it produces at a given distance squared, i.e. illumination (fc)
= Intensity (cd) / Distance2 (ft2).
Iodide
A halogen gas used in lamps to maintain proper color temperature
and to keep the inside wall of the envelope clean.
IR
Abbreviation for Infrared.
Iris
An abridged, but commonly used version of Iris Diaphragm.
Iris Diaphragm
An arrangement of thin movable heat-resistant metal plates, i.e.
leaves, that form an adjustable circular opening. They are usually
placed within an ellipsoidal spotlight or follow spot in order to
adjust the diameter of the beam, or in some cases, to mechanically
dim the beam.
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