Photopic (black line) and scotopic [1] (green line) luminosity functions. The photopic includes the CIE 1931 standard (solid),[2] the Judd-Vos 1978 modified data (dashed),[3] and the Sharpe, Stockman, Jagla & Jägle 2005 data (dotted).[4] The horizontal axis is wavelength in nm.Integrating sphere used for measuring the luminous flux of a light source
In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light), in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
In photometry, luminousflux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power...
symbols sometimes seen: W for luminous energy, P or F for luminousflux, and ρ for luminous efficacy of a source. Luminous intensity should not be confused...
Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminousflux to power, measured in lumens per watt...
perception. Similarly, luminous emittance is the luminousflux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance. In SI...
18-1967 Alternative symbols sometimes seen: W for luminous energy, P or F for luminousflux, and ρ for luminous efficacy of a source. Luma (video) Luminance...
sometimes seen: W for luminous energy, P or F for luminousflux, and ρ for luminous efficacy of a source. If a source emits a known luminous intensity Iv (in...
The lux (symbol: lx) is the unit of illuminance, or luminousflux per unit area, in the International System of Units (SI). It is equal to one lumen per...
\theta _{\Sigma }}}} where Lv is the luminance (cd/m2); d2Φv is the luminousflux (lm) leaving the area dΣ in any direction contained inside the solid...
18-1967 Alternative symbols sometimes seen: W for luminous energy, P or F for luminousflux, and ρ for luminous efficacy of a source. Buser, Pierre; Imbert...
18-1967 Alternative symbols sometimes seen: W for luminous energy, P or F for luminousflux, and ρ for luminous efficacy of a source. electropedia, International...
}(\lambda )\,\mathrm {d} \lambda ,} where Φv is the luminousflux, in lumens; Φe,λ is the spectral radiant flux, in watts per nanometre; y(λ), also known as...
Flux footprint Flux pinning Flux quantization Gauss's law Inverse-square law Jansky (non SI unit of spectral flux density) Latent heat fluxLuminous flux...
(lm⋅s) is the unit of luminous energy in the International System of Units (SI). It is based on the lumen, the SI unit of luminousflux, and the second, the...
can see the way ahead. Serving the latter purposes require much more luminousflux and thus more power. Many jurisdictions require one or more bicycle...
contexts, the reason PAR is preferred over other lighting metrics such as luminousflux and illuminance is that these measures are based on human perception...
the field of photometry (optics), the luminous transmittance of a filter is a measure of the amount of luminousflux or intensity transmitted by an optical...
(lm/W)}}} Where ϕ u s e {\displaystyle \phi _{use}} is the declared useful luminousflux (in lm), P o n {\displaystyle P_{on}} is the declared on-mode power...
illuminance, luminance, and luminousflux. Photometers of various kinds: Lux meter for measuring illuminance, i.e. incident luminousflux per unit area Luminance...
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