Isnt't Luminous Opening effect Unreal IES profile?

Development Rendering
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1

According to IES file format, IES file can define luminous opening such as rectangle, circular etc.

So I tried to make rectangle light with IES profile that defines rectangler luminous opening.
But Luminous Opening doesn’t show on the light.

Couldn’t Luminous Opening defined by IES profile be effect?

2

My work is following

  1. Spawn Point light

  2. Adapt IES file that defines rectangular luminous opening to The point light.