This filter, accessible through Filters/Light Effects/Lens Flare, makes part of an image stand out by brightening the pixels, with the surrounding pixels becoming progressively less bright. As the name implies the effect is as of a bright flare.
In the "Lens Flare" dialog set the following:
Use the Brightness slider (or type directly into the box) to increase the brightness of the flare. The maximum is 500% or five times the original brightness.
In the X and Y boxes you can set the location of the flare. The location is measured in pixels from the top left-hand corner of the image window.
Your settings will be displayed in the Preview box.
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