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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- E-viton (erytheme)
- effect projector
- effective ceiling cavity reflectance, ρcc
- effective floor cavity reflectance, ρfc
- effective intensity (search lighting)
- efficacy
- efficiency
- egress
- electric discharge
- electric-discharge lamp
- electrodeless fluorescent lamp
- electroluminescence
- electromagnetic spectrum
- elevation
- ellipsoidal reflector spotlight
- emergency exit
- emergency lighting
- emissivity
- emittance
- enclosed and gasketed luminaire
- equal interval (isophase) light
- equipment operating factor
- equivalent contrast, C̃
- equivalent contrast, C̃e
- equivalent luminous intensity of an extended source at a specified distance
- equivalent sphere illuminance, ESI
- equivalent veiling luminance
- erythema
- erythemal action spectrum
- erythemal dose
- erythemal effectiveness
- erythemal exposure
- erythemal flux
- erythemal flux density
- erythemal radiation
- erythemal threshold
- erythemal unit (EU)
- excimer lamp
- excitation purity of a light
- Exempt Group
- exit
- exit access
- exit discharge
- exit sign
- exitance
- exitance coefficient, EC
- explosion-proof luminaire
- exposure dose rate
- exposure limit
- externally illuminated exit sign
- eye light