Lúisne agus Soilseoireacht

Anfocht is an anfocht rianach a fhaightear ag comhshaoil an déteicóra. Is W/m2 an aonad le anfocht. Deimhnítear an anfocht le Ee,λ,

φs is the received radiant flux on the detector surface and AD is the detector area or surface.
Anfocht leanann i gcónaí an Dlí Comhréiteach. Má tá anfocht rianach á faighte ó shruthán aon phointe do dhá uachtar A1 agus A2 ina ndéantar aon uachtar chomh mór, agus iad suite ag r1 agus r2 fad.

Anois an rianach a fhaightear ag an suíomh

Agus an rianach a fhaightear ag an suíomh
Áit, Ie,λ tionscal gairid agus ω uillinn solíd.

Arís an rianach rianach a fhaightear ar an aonad uachtar don A1 agus A2 are

Anseo A1 agus A2 are equal.
Putting the φe,λ = Ie,λ ω in the equation we get

Is é seo an Dlí Comhréiteach don anfocht.

Má dhéanaimis an anfocht seo a athrú go Soilleir ní mór dúinn an cothromóide dathaithe a leanúint, seachas

Áit, Km is the constant which is called maximum spectral luminous efficacy and its value is 683 lm/W.
By definition the luminous flux received by unit area of the detector is called Illuminance.
Its unit is Lux or Lumen per sq. meter (lm/sq. m).
It also follows the same inverse square law, i.e.


Ev is related to the surface dA where luminous flux is falling on this surface perpendicularly.
E’v is related to the surface dA’ where this surface creates an angle Ɵ to the base plane.
As per figure above,

This above equation can be written making it generalized,

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