Calculation of Direct Illuminance
※Case:Rectangle Shaped Light Source.

Keyword

Direct Illuminance,Rectangle Shaped Light Source,Luminous intensity.

Reference

[1]:『照明ハンドブック第２版』(照明学会).

Remarks

・Eh=I/2*(a/((a^2+h^2)^0.5)*arctan(b/((a^2+h^2)^0.5))+b/((b^2+h^2)^0.5)*arctan(a/((b^2+h^2)^0.5))).
・Ev=I/2*(arctan(a/h)-h/((b^2+h^2)^0.5)*arctan(a/((b^2+h^2)^0.5)).
・Fig1:Reference[1].

History

・2014/08/06：layout change.
・2009/11/06：Upload.