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Brightness determines the factor by which the GUI’s emitted light is scaled. By default, this property is 1 and can be set to any number on the range [0, 1000].

By modifying this property, the apparent brightness of a GUI can be better matched to its environment. For instance, a video billboard like those found in Times Square can be made brighter to be clearly visible on a bright day.

This property won’t produce any effect in the following scenarios wherein the GUI does not emit light.:

  • When BillboardGui/AlwaysOnTop|AlwaysOnTop is true, the color of each pixel is the color shown on-screen.
  • When BillboardGui/LightInfluence|LightInfluence is 1, all light from the GUI is reflected from the environment instead of being emit.