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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- hue of a perceived color
- Hunt Effect
- hybrid LED luminaire
- hydrargyrum medium arc length iodide (HMI) lamp
- ice detection light
- ideal radiator
- identification beacon (aeronautical lighting)
- ignitor
- illuminance
- illuminance (lux or footcandle) meter
- illumination
- incandescence
- incandescent filament lamp
- 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
- integrated flash intensity
- integrating photometer
- integrating sphere
- intensity
- intensity (candlepower) distribution curve
- inter-lock
- interflectance method*
- internally illuminated exit sign
- interreflected component
- interreflection
- interrupted quick-flashing light
- inverse-square law
- iris
- irradiance (E)
- isocandela line
- isolation transformer
- isoluminance line
- isolux (isofootcandle) line
- junior
- key light
- kicker
- klieg light
- Kosochmieder’s law
- laboratory reference standard
- ladder
- lambert
- Lambertian surface
- Lambertian units of luminance
- Lambert’s cosine law
- lamp
- lamp burnout factor
- lamp control
- lamp failure
- lamp lumen depreciation, LLD
- lamp position factor
- lamp post
- lamp shielding angle, ϕ
- landing direction indicator
- landing light
- landmark beacon
- laser
- lateral width of a light distribution
- law of reciprocity (Bunsen-Roscoe law)
- LED array or module
- LED control circuitry
- LED die
- LED driver
- LED driver, Class II
- LED lamp, integrated
- LED lamp, non-integrated
- LED light engine
- LED luminaire
- LED package
- LED power source
- LED power supply
- Leko
- lens
- level of illumination
- life of a test lamp
- life performance curve
- life test of lamps
- life test racks
- light
- light adaptation
- light center
- light center length (LCL)
- light emitting diode (LED)
- light lift
- light loss factor (LLF)
- light meter
- light output ratio