Contrary to the name, it is not a light but a color with high intensity, the idea is to have a high enough value to activate the possible bloom.
Here is an example that uses only the center high light, the flare is rendered by the convolution bloom of unreal engine.
Here is an example that uses only the center high light, the flare is rendered by the standard bloom of unreal engine.
Center hight light is rendered with a Radial gradient exposent.
CenterHighLight_Radius : Effective size , 0 to 0.5
CenterHighLight_Density : Density of the gradient
CenterHighLight_Tint : Color to multiply
CenterHighLight_Power : The center high light passes in a power function, allows to change the style of gradient.
CenterHighLight_Boost : Multiple of the rendering which allows or not to activate the bloom, choose a strong value.
CenterHighLight_UseDynamicMask : Allows to use an occlusion test independent of the global occlusion test (useful in case you want to disable the global occlusion test).