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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h
- hard light
- hazard or obstruction beacon (aeronautical lighting)
- hazardous location
- haze factor
- headlamp
- headlight
- heat extraction thermal factor
- heavy duty floodlight, HD
- heliotherapy
- Helmholtz-Kohlraush Effect
- hemispherical-conical reflectance
- hemispherical-conical transmittance
- hemispherical-directional reflectance
- hemispherical-directional transmittance
- hemispherical reflectance*
- hemispherical transmittance*
- high-bay lighting
- high hat
- high intensity discharge (HID) lamp
- high-key lighting
- high-mast lighting
- high pressure sodium (HPS) lamp
- horizontal exit
- horizontal plane of a searchlight
- horizontal shadow angle
- hot-cathode lamp
- house lights
- HSL color space
- HSV color space
- hue-angle bin
- hue angle (h)
- hue of a perceived color
- Hunt Effect
- hybrid LED luminaire
- hydrargyrum medium arc length iodide (HMI) lamp
i
- ice detection light
- ideal radiator
- identification beacon (aeronautical lighting)
- ignitor
- illuminance
- illuminance (lux or footcandle) meter
- illumination
- incandescence
- incandescent filament lamp
- incident angle
- incident dose (exposure dose)
- incomplete diffusion (partial diffusion)
- index of illuminant metamerism
- index of observer metamerism
- index of sensation, M
- indirect actinic effect (of optical radiation)
- indirect component
- indirect lighting
- infrared lamp
- infrared radiation
- inhibition
- initial luminous exitance
- inky
- instant-start fluorescent lamp
- instrument
- instrument schedule
- insulated glazing units
- integrated flash intensity
- integrating photometer
- integrating sphere
- intensity
- intensity (candlepower) distribution curve
- inter-lock
- interflectance method*
- internally illuminated exit sign
- internally reflected component (IRC)
- interreflected component
- interreflection
- interrupted quick-flashing light
- inverse-square law
- iris
- irradiance (E)
- isocandela line
- isolation transformer
- isoluminance line
- isolux (isofootcandle) line
j
- Julian day
- junior
k
- key light
- kicker
- klieg light
- Kosochmieder’s law
l
- laboratory reference standard
- ladder
- lambert
- Lambertian surface
- Lambertian units of luminance
- Lambert’s cosine law
- laminated glass
- lamp
- lamp burnout factor
- lamp control
- lamp failure
- lamp lumen depreciation, LLD
- lamp position factor