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
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- Sample Color Fidelity (Rf,CESi)
- saturation of a perceived color
- scene master
- scenic projector
- schedule (television, film, theater)
- scoop
- scotopic vision
- scrim
- scroller
- sealed-beam headlamp
- sealed-beam lamp
- sealed-beam spotlight
- searchlight
- seasoning
- seasoning time
- secondary standard
- self-ballasted lamps
- self-luminous exit sign
- semi-direct lighting
- semi-indirect lighting
- senior (television, film, theater)
- service period
- set light
- shade
- shade (daylighting)
- shading coefficient
- shielding angle (of a luminaire)
- short-arc (compact-arc) lamp
- shutters
- SI unit of luminance
- side-back light
- side light
- side marker lamps
- signal shutter
- signaling light
- signaling system
- silicon controlled rectifier, SCR
- size threshold
- sky glow
- sky light
- sky luminance distribution function
- skylight
- snoot
- soft light
- solar constant
- solar efficacy
- solar illuminance constant
- solarium
- solid angle
- solid angle factor, Q
- spacing (roadway)
- spacing-to-mounting-height ratio, S/MH
- spatial daylight autonomy (sDA)
- special color rendering index
- specific illumination
- 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