Calculation of Direct Illuminance
※Case:Cylindrical Light Source that the radius is small enough compared with length.

Keyword

Direct Illuminance,Cylindrical Light Source,Luminous intensity.

Reference

[1]:『照明ハンドブック第2版』(照明学会).

Remarks

・En=I/(2*p)*(α+sin(α)*cos(α)).
・Eh=En*cos(θ).
・Evx=En*sin(θ).
・Evy=I/(2*p)*(sin(α))^2.
・Fig1:Reference[1].

History

・2014/08/04:Layout change.
・2009/10/21:Modification about Remarks.
・2009/10/20:Fixing about unit of Luminous intensity. cd→cd/m.
・2009/10/18:Upload.