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-directional emissivity
- spectral-hemispherical emissivity
- spectral luminous efficacy of radiant flux
- spectral luminous efficiency for photopic vision
- spectral luminous efficiency for photopic vision, V(λ)
- spectral luminous efficiency for scotopic vision
- spectral luminous efficiency of radiant flux
- spectral radiance
- spectral radiant energy
- spectral radiant exitance and irradiance
- spectral radiant fluence
- spectral radiant fluence rate
- spectral radiant flux
- spectral radiant intensity
- spectral radiant sterisent
- spectral reflectance
- spectral (spectroscopic) lamp
- spectral-total directional emissivity
- spectral-total hemispherical emissivity
- spectral transmittance
- spectral tristimulus values
- spectral tuning
- spectrophotometer
- spectroradiometer
- spectrum locus
- specular angle
- specular reflectance
- specular reflection
- specular surface
- specular transmission
- specular transmittance
- speed of light
- speed of vision
- sphere illuminance
- spherical reduction factor*
- spider
- splay
- spot
- spotlight
- stabilization
- stabilization time
- stage manager’s panel
- stage plug
- standard colorimetric observer
- standard erythemal dose
- standard illuminant
- standard illuminant A
- standard illuminant C
- standard illuminant D65
- standard source
- standard source A
- standard source C
- starter
- state of chromatic adaptation
- Stefan-Boltzmann law
- stencil face exit sign
- stilb
- Stiles-Crawford effect
- stop lamp
- stray light (in the eye)
- street lighting luminaire
- street lighting unit
- striplight (television, film and theater)
- stroboscopic lamp (strobe light)
- sub-master
- subjective brightness
- sunburn
- sunlight
- suntan
- supplementary lighting
- supplementary standard illuminant D55
- supplementary standard illuminant D75
- surface mounted luminaire
- suspended (pendant) luminaire
- switch-start fluorescent lamp
- switchboard
- table lamp
- Table T-1: Luminance Conversion Factors
- Table T-2: Standard Units, Symbols, and Defining Equations for Fundamental Photometric and Radiometric Quantities*
- Table T-3: Illuminance Conversion Factors
- Table T-4: Definitive Values of the Special Luminous Efficiency Function for Photopic Vision V(λ)
- Table T-5A: Color-Matching Functions and Chromaticity Coordinates of CIE 1931 Standard Colorimetric Observer
- Table T-5B: Color-Matching Functions and Chromaticity Coordinates of CIE 1964 Supplementary Standard Colorimetric Observer
- Table T-6: Relative Spectral Power Distribution of CIE Illuminant “C”
- Table T-7: Scotopic Spectral Luminous Efficiency Values, V′(λ) (Unity at Wavelength of Maximum Luminous Efficacy)
- Table T-8: Tentative Bactericidal Efficiency of Ultraviolet Radiation
- Table T-9: CIE 1988 Modified Two-Degree Spectral Luminous Efficiency Function for Photopic Vision
- tail lamp
- talbot (T)
- tanning lamp
- task-ambient lighting
- task lighting
- task tuning
- taxi-channel lights
- taxi light
- taxiway centerline lights
- taxiway-edge lights
- taxiway holding-post light
- taxiway lights
- temperature radiator