You're looking at Effect>Generate>Vegas.
You'll need to draw a mask with at least three vertices to get it to work. Also set VEgas towork with a mask instead of the default, Image Contour.
You'll have to swap the values for starting and end values to get the streak to look right - ie. thick to thin. You animate Vegas using its rotation parameter.
Add some Glow to taste and use the Add Blending Mode.
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Cheers
RoRK
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