ANSI/IES LS-1-25, Lighting Science: Nomenclature and Definitions for Illuminating Engineering
The IES defines illumination engineering terms in ANSI/IES LS-1-25, is available here online. You can search terms by their first letter using the categories listed in the Categories window, by the first letter of the term in the alphabetical list below, or by typing the term in the search window. You can find the Introduction material for LS-1-25 on these pages:
- Copyright, Disclaimer, and American National Standards Statement
- Preface, Nomenclature Committee members, Introduction, and Scope
- Spectral Parameters Used in Illumination Engineering
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c
- colorimetry
- color matching
- color matching functions (spectral tristimulus values)
- color media
- color preference index (of a light source)
- color rendering
- color rendering index (CRI) (of a light source)
- color space
- color temperature of a light source
- color tuning
- Color Vector Graphic (CVG)
- color wheel
- compact-arc lamp
- compact fluorescent lamp, CFL
- compact source iodide (CSI) lamp
- company switch
- comparison lamp
- complementary wavelength of a light
- complete diffusion
- concert border
- cones
- configuration factor, c1→2
- conical-directional reflectance
- conical-directional transmittance
- conical-hemispherical reflectance
- conical-hemispherical transmittance
- console
- conspicuity
- constant current transformer
- continuous daylight autonomy (cDA)
- continuous wave (CW) lamp
- contour light
- contrast
- contrast rendition factor, CRF
- contrast sensitivity
- contrast threshold
- control board
- cookie
- cornice lighting
- correlated color temperature (CCT) of a light source
- cosine-cubed law
- cosine law
- counter-key light
- country beam
- course light
- cove base
- cove lighting
- criteria rating
- critical flicker frequency (cff)
- critical task location
- cross connect
- cross fade
- cross fader
- cross-lighting
- cucoloris
- cue
- cut-off angle (of a luminaire)
- cutout
- cutter
- cyclorama (“cyc”)
d
- dark adaptation
- daylight
- daylight autonomy (DA)
- daylight availability
- daylight coefficient
- daylight conversion filter
- daylighted
- daylight factor
- daylight harvesting
- daylighting
- daylighting system
- daylight lamp
- daylight louver
- daylight management
- daylight window
- daylight zone
- daylit
- densitometer
- designer’s remote
- deuce
- dichroic filter
- diffused lighting
- diffuser
- diffuse reflectance
- diffuse reflection
- diffuse sky radiation
- diffuse transmission
- diffuse transmittance
- diffusing panel
- diffusing surfaces and media
- digital multiplex, DMX
- dim
- dimmer
- dimmer board
- dimmer curve
- dimmer per circuit
- dimming
- dim to warm
- direct actinic effect (of optical radiation)
- direct component