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Hmm... that's rather hard. My tought is by using a large size outer glow and multiply that layer several time and changing the blending mode to something else (probably screen/overlay/linear dodge/color dodge/whatever). Maybe Filter > Render > Lightning Effect, or maybe by just changing the exposure (Image > Adjustments > Exposure) or adjusting the level (Image > Adjustments > Level) or curves (Image > Adjustments > Curves)... Or maybe by merging the overexposure, normal, and underexposure image into a HDR file... nevermind...
Well, I guess there's many ways to do this...
EDIT : Tracing glow
After you create the path with the pen tool. First grab your brush tool and adjust the size/hardness/color to suit you line and then back to the pen tool. Right click > Stroke Path... > choose brush and OK. Then add the effect to the layer where you stroke it.
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