Term nodes beginning with "R"

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radial road
radiance (in a given direction, at a given point of a real or imaginary surface) [Le]
radiance coefficient (at a surface element of a medium, in a given direction, under specified conditions of irradiation) [qe]
radiance dose (in a given direction, at a given point of a real or imaginary surface) [Lt]
radiance factor (at a surface element of a non self-radiating medium, in a given direction, under specified conditions of irradiation) [β]
radiance temperature (of a thermal radiator, for a specified wavelength)
radiant cylindrical exposure (at a point, for a given direction and duration) [He,z]
radiant efficiency (of a source of radiation) [ηe]
radiant energy [Qe]
radiant exitance (at a point of a surface) [Me]
radiant exposure (at a point of a surface, for a given duration) [He]
radiant exposure meter
radiant fluence (at a point, for a given exposure duration) [He,o]
radiant fluence rate (at a point) [Ee,o]
radiant flux [Φe; P]
radiant intensity (of a source, in a given direction) [Ie]
radiant power [Φe; P]
radiant spherical exposure (at a point, for a given duration) [He,o]
radiation, electromagnetic
radioluminescence
radiometer
radiometry
rain-proof luminaire
raised pavement marker (US)
rated luminous flux (of a type of lamp)
rated power (of a type of lamp)
rating (of a lamp)
readability
rear fog light
rear position light
rear registration-plate light
recessed luminaire
reciprocal colour temperature
reciprocating lights
reciprocity law
reduced luminance coefficient (for a point on a surface) [r]
reference ballast
reference colour stimuli
reference direction (of a floodlight)
reference illuminant
reference lamp (for testing ballasts)
reference lighting
reference location
reference medium
reference plane
reference point
reference surface
reflectance (for incident radiation of given spectral composition, polarization and geometrical distribution) [ρ]
reflectance (optical) density [Dρ]
reflectance factor (at a surface element, for the part of the reflected radiation contained in a given cone with apex at the surface element, and for incident radiation of given spectral composition, polarisation and geometric distribution) [R]
reflectance factor (optical) density [DR]
reflected (global) solar radiation
reflected luminance factor (at a surface of a non-self-radiating medium in a given direction, under specified conditions of illumination) [βv,R]
reflected radiance factor (at a surface of a non-self-radiating medium in a given direction, under specified conditions of illumination) [βR]
reflection
reflective sign
reflectivity (of a material) [ρ∞]
reflectometer
reflector
reflector lamp
reflector spotlight
reflectorized bulb
refraction
refractive index (of a medium, for a monochromatic radiation of wavelength, λ, in vacuum) [n(λ)]
refractor
regular reflectance [ρr]
regular reflection
regular transmission
regular transmittance [τr]
related colour
relative colour stimulus function [φ(λ)]
relative optical air mass [m]
relative responsivity (of a detector) [sr]
relative spectral distribution (of a radiant, luminous or photon quantity X(λ)) [S(λ)]
relative spectral responsivity (of a detector) [sr(λ)]
relative sunshine duration
relevant boundary (of a residential property)
rendering intent
residential area
residential property
residential street
resonance line
response time (of a detector)
responsivity (of a detector) [s]
resultant colorimetric shift
resultant colour shift
retina
retinal burn
retinal hazard spectral region
retinal thermal hazard spectral weighting function [r(λ)]
retinal thermal injury
retinal thermal radiance [Lr]
retroreflectance
retroreflection
retroreflective element
retroreflective material
retroreflector
reversing light
rhythmic light