safety lighting |

sampling aperture |

saturation |

scalar illuminance |

scalar irradiance |

scattering |

scattering indicatrix (for a specified incident beam) |

scintillator |

scotopic vision |

screw base (US) |

screw cap |

sealed beam lamp |

searchlight |

secondary light source |

secondary photometric standard |

secondary standard lamp |

sector light |

SED (abbreviation) |

selective detector (of optical radiation) |

selective diffusion |

selective filter |

selective radiator |

self-ballasted mercury lamp (US) |

self-calibrating thermal detector |

self-exchange coefficient (of a surface when its radiance or luminance is the same at all points and for all directions) [gs] |

semi-cylindrical illuminance (at a point) [Esc] |

semi-direct lighting |

semi-indirect lighting |

semiconductor ballast |

sensitivity |

series cathode heating |

series cathode preheating |

service illuminance (of an area) |

service road |

shade |

shading |

shell base (US) |

shell cap |

shielding angle |

shopping street |

short-arc lamp |

side-marker light (US) |

sidelight (of vehicles) |

sidelight (of vessels) |

sidewalk (US) |

sign |

sign geometry |

sign matrix |

sign panel (US) |

sign plate |

sign, traffic |

signal light |

single-coil filament |

skid resistance |

skin hazard distance |

sky component of daylight factor [Ds] |

sky factor |

sky glow |

sky illuminance [Evd] |

sky luminance [Lv] |

skylight |

socket |

softcopy |

softlight |

solar constant [Eeo] |

solar factor (of glazing material) [g] |

solar radiation |

solid angle (of an area subtended at a point) |

source |

spacing (in an installation) |

special floodlight |

spectral |

spectral absorbance (of a homogeneous non-diffusing layer) [Ai(λ)] |

spectral absorption index (of a heavily absorbing material) [κ(λ)] |

spectral absorptivity (of an absorbing material) |

spectral basis functions |

spectral chromaticity coordinates [r(λ), g(λ), b(λ); x(λ), y(λ), z(λ); r10(λ), g10(λ), b10(λ); x10(λ), y10(λ), z10(λ)] |

spectral concentration (of a radiant, luminous or photon quantity) [Xλ(λ); (Xλ)] |

spectral distribution [Xλ(λ); (Xλ)] |

spectral internal absorptance (of a homogeneous non-diffusing layer) [αi(λ)] |

spectral internal transmittance (of a homogeneous non-diffusing layer) [τi(λ)] |

spectral internal transmittance density (of a homogeneous non-diffusing layer) [Ai(λ)] |

spectral irradiance [Eλ] |

spectral line |

spectral linear absorption coefficient (at a point in an absorbing medium, for a collimated beam of radiation) [a(λ)] |

spectral linear attenuation coefficient (at a point in an absorbing and scattering medium, for a collimated beam of radiation) [µ(λ)] |

spectral linear scattering coefficient (at a point in a diffusing medium, for a collimated beam of radiation) [s(λ)] |

spectral luminous efficiency (of a monochromatic radiation of wavelength λ) [V(λ) for photopic vision; V'(λ) for scotopic vision] |

spectral mass attenuation coefficient |

spectral mismatch correction factor (for a photometer) [F*] |

spectral optical depth (of a medium, for a given length) [δ(λ)] |

spectral optical thickness (of a medium, for a given length) [δ(λ)] |

spectral quantum efficiency of the fluorescent process [ηµ(µ)] |

spectral radiance (for a wavelength interval dl, in a given direction at a given point) [Lλ] |

spectral responsivity (of a detector) [s(λ)] |

spectral stimulus |

spectral transmissivity (of an absorbing material) |

spectral weighting function |

spectrally neutral |