Clarification Needed for Rect Lights Solid Angle Definition

General Feedback & Requests
,
1

Hello,

I have a question regarding the definition of the solid angle for Rect Lights in the Unreal Engine documentation. The current documentation states that the solid angle for Rect Lights is 2π steradians (sr). However, considering the following equation:

Illuminance (1 cd) ≈ 3.14 * Illuminance (1 lm)

For this equation to be accurate, shouldn’t the solid angle for Rect Lights be π steradians (sr) instead of 2π sr?

Could you please clarify this? If there is an error, could the documentation be updated accordingly?

Thank you.