Map Editor : How to set up a point light

Right click on the viewport and select “Add actor” > Add Light (Point):

A point light should appear:

Then you can scale it (press space to change to the scaling mode):

Modify the brightness from properties (double click on the light icon or press F4): Light > Light Component > Light Component > Brightness. Here, brightness = 2:

Modify the brightness from properties (double click on the light icon or press F4): Light > Light Component > Light Component > Brightness. Here, brightness = 0.5:

Next you can change the light color: Light > Light Component > Light Component > Light Color.

Finally, you can change the falloff exponent: Light > Light Component > Point Light Component > Falloff Exponent.
Here, falloff exponent = nearly 0.

Finally, you can change the falloff exponent: Light > Light Component > Point Light Component > Falloff Exponent.
Here, falloff exponent = 1.

Finally, you can change the falloff exponent: Light > Light Component > Point Light Component > Falloff Exponent.
Here, falloff exponent = 3.