It's tricky doing it with a brush preset, because moving the brush continues to lay down colour which thickens the glowing edges. If you define this as a brush preset.
And set spacing to 15% it will give you the effect below. The line is a brush stroke, and below is a single stamp of the brush. Note: you canm see each stamp down in the upper line because of the wide spacing, so not ideal.
It's much better to use a Layer Style. In this case Outer Glow
If you create something that you like, then save it as a New Style so you can simply select a layer and click on the Style, and it is done.
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