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Luminous EnergyUnits Type

In photometry, luminous energy is the perceived energy of light. This is sometimes called the quantity of light. Luminous energy is not the same as radiant energy, the corresponding objective physical quantity. This is because the human eye can only see light in the visible spectrum and has different sensitivities to light of different wavelengths within the spectrum. When adapted for bright conditions (photopic vision), the eye is most sensitive to light at a wavelength of 555 nm. Light with a given amount of radiant energy will have more luminous energy if the wavelength is 555 nm than if the wavelength is longer or shorter. Light whose wavelength is well outside the visible spectrum has a luminous energy of zero, regardless of the amount of radiant energy present.

Term

luminousEnergy

Category

Photometry

Provenance

QUDT

Provenance Uri

http://qudt.org/schema/qudt#LuminousEnergyUnit

Note

-

Default Unit

Lumen Second (lm s)

Dimension Symbol

U1T1J1

Dimension Length

1

Dimension Mass

0

Dimension Time

0

Dimension Current

1

Dimension Temperature

0

Dimension Amount

0

Dimension Light

0