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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l
- luminous flux
- luminous flux density at a surface
- luminous flux maintenance
- luminous intensity
- luminous intensity distribution curve
- luminous range
- luminous reflectance
- luminous sterisent
- luminous transmittance
- lux
- lux meter
m
- maintenance factor (MF)
- Martingale
- master
- matte
- matte surface
- mean horizontal intensity (candlepower)*
- mean spherical luminous intensity
- mean zonal candlepower
- means of egress
- median life
- memory
- mercury-fluorescent lamp (phosphor mercury lamp)
- mercury lamp
- mesopic vision
- message
- metal halide lamp
- metamerism
- metamers
- meteorological optical range
- midget
- Mie scatter
- miniblinds
- minimal perceptible erythema
- minimum erythemal dose
- MIRED
- modeling light
- modulation threshold
- monocular visual field
- motion detector
- mounting height, MH (interior)
- mounting height, MH (roadway)
- multiple-beam headlamp
- Munsell chroma
- Munsell color system
- Munsell hue
- Munsell value
n
- nanometer (nm)
- narrow-angle diffusion
- narrow-angle luminaire
- national standard of light
- navigation light system
- near field
- night
- nit (nt)
- nocturnal
- nominal range of a light signal
- non-dim circuit
- non-general lighting source lamp
- non-lens spotlight
- nonrecoverable light loss factor (initial or maintained)
o
- Obie light
- object color
- obstruction beacon
- obstruction lights (aeronautical lighting)
- obtrusive light
- occulting light
- occupancy sensor
- olivette
- on-off ratio (or mark-space ratio) for a repeated single flash
- one-K
- opaque medium
- opponent channels
- optical radiation
- organic light emitting diode (OLED)
- orientation
- Ostwald color system
- overcast sky
- overhang
- overhead (or butterfly)
- ozone-producing radiation
p
- paddle
- panel face exit sign
- pantograph
- PAR lamp
- par light
- parabolic spotlight
- parallel (television, film, theater)
- parking lamp
- partial diffusion
- partly cloudy sky
- passing beams
- patch
- patch panel
- pattern spotlight
- peak wavelength (λp)
- pendant luminaire
- perceived chroma of an area of surface color
- perceived color
- perceived light source color