Define rectangle light distribution according to length

[anonymous_user_55d05049]

I want the following unique rectangle light.

Size : 20cm × 5cm
Intensity is changed according to range
500cd (range : from Center to 10cm × 2.5cm rect)
250cd (range: from 10cm × 2.5cm range to 20cm × 5cm)

At first, in my idea ,it can be achieved by IES profile.
But IES profile defines a point light distribution not area light (multiple lights) distribution.

So how to define rectangle light distribution according to lenght of light ?

This seems to be similar question.

Linear Lights IES

I have the same issue in Unreal and have tried using spotlights with limited success. Hopefully Epic can start utilizing the luminous area in the IES and associate that to the length of a rect light.

I and he (who posts above question) want a Light that distribute linear lights.
We’re looking for not rectLight based on point light…

I hope Epic add the above function…