ANSI/IES LS-1-25, Lighting Science: Nomenclature and Definitions for Illuminating Engineering
The IES defines illumination engineering terms in ANSI/IES LS-1-25, 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-1-25 on these pages:
- Copyright, Disclaimer, and American National Standards Statement
- Preface, Nomenclature Committee members, Introduction, and Scope
- Spectral Parameters Used in Illumination Engineering
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f
- facade orientation
- fade
- fader
- far field
- FAY light
- fenestra method
- fenestration
- Fidelity Index (Rf)
- field angle
- field efficiency
- field lumens
- fill light
- film (or aperture) color
- filter
- filter (television, film, theater)
- finsen
- fiver (or five-K)
- fixed light
- fixed light equivalent
- fixture
- flag
- flash duration (on-period)
- flash frequency
- flashing light
- flash interval (off-period)
- flash period
- flashtube
- flicker
- flicker index
- flicker photometer
- floodlight (exterior lighting)
- floodlighting
- floodlight (television, film, theater)
- flood (television, film, theater)
- floor cavity
- floor cavity ratio, FCR
- floor lamp
- floor pocket
- floren
- fluorescence
- fluorescent lamp
- flush mounted or recessed
- flux transfer theory
- fog (adverse weather) lamps
- follow spot (light)
- footcandle
- footcandle meter
- footlambert
- footlights
- formation light
- form factor, f1→2
- forward ray tracing
- fovea
- foveal vision
- frequency
- Fresnel spotlight
- fringe light
- front lighting
- front of house (FOH) intercept panel
- front of house (FOH) spots
- funnel
- fuselage lights