Neon effect made in Illustrator. 
First I set my documents color to RGB, then made a square background which I gave the color black. That's because to make my neon color stands out. 
Then I just wrote a text with the T tool, and created an outline to make the text an object. 
I changed the color of the object to a bright, strong color and then I created an offset path. 
The offset path created another version of my object but with a slide offset. 
I gave the offset path object a lighter color than my original object, so it looks like the offset path is creating the light/the glow. Last I selected the darker object and gave it the gaussian blur, so the object got more glowy and neon-ish. 

Neon Effect
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Neon Effect

Neon Text Color

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