ANSI/IES LS-1-22, Lighting Science: Nomenclature and Definitions for Illuminating Engineering
The IES defines illumination engineering terms in ANSI/IES LS-1-22, 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-1-22 on these pages:
- Copyright, Disclaimer, and American National Standards Statement
- Foreword, Nomenclature Committee members, Introduction, and Scope
- Spectral Parameters Used in Illumination Engineering
Search:
(clear)
- CAM02-UCS
- camera light
- candela
- candlepower
- carbon arc
- carbon-arc lamp
- cavity ratio, CR
- ceiling area lighting
- ceiling cavity
- ceiling cavity ratio, CCR
- ceiling projector (search lighting)
- ceiling ratio
- center-beam candlepower (CBCP)
- center high-mounted stop lamp, CHMSL
- central (foveal) vision
- central visual field
- centroid wavelength
- channel
- channel lights (aeronautical lighting)
- characteristic curve
- chroma
- chromatic adaptation
- chromatic color
- chromatic contrast threshold (color contrast threshold)
- chromaticity coordinates of a color, x,y,z
- chromaticity diagram
- chromaticity difference thresholds
- chromaticity maintenance (of a light source)
- chromaticity of a color
- chromaticity shift (of a light source)
- CIE 1988 2° modified spectral luminous efficiency function for photopic vision
- CIE (L*a*b*) uniform color space
- CIE (L*u*v*) uniform color space
- CIE photopic luminous efficiency function
- CIE scotopic luminous efficiency function
- CIE standard chromaticity diagram
- CIECAM02
- circadian
- circling guidance lights
- clear sky
- clearance lamps
- clerestory
- cloudy sky
- code (or character)
- coefficient of attenuation (at a point in a given direction), µ
- coefficient of beam utilization, CBU
- coefficient of utilization, CU
- coffer
- cold-cathode fluorescent lamp
- cold-cathode lamp
- color
- color appearance model
- color comparison, or color grading
- color contrast thresholds
- color correction (of a photograph or printed picture)
- color difference thresholds
- color discrimination
- color evaluation sample
- color fidelity
- color fidelity index
- color frame
- 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
- colorfulness of a perceived color
- colorimeter
- colorimetric purity of a light
- colorimetric shift
- colorimetry
- 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 wave (CW) lamp
- contour light
- contrast
- contrast rendition factor, CRF
- contrast sensitivity
- contrast threshold