This post help you how to create the simple curve with glow effect with differnt colors with dark background with Photoshop. Here is the steps to create the glow effect with the help of photoshop. Each steps having the perfect screenshots, So you can easily learn this effects.
File->New ->Set width and height u want.
Set Background as a Black
Double Click Background Layer and make it as a layer
Select White color
Create a New Layer
Using Pen tool Draw the Shape
Go to path and select the stroke path
Select in this Stroke path in Brush Tool and then click ok. If unselected the simulate pressure please select it.
Now it will look like this
In path Select the Delete path
Now it will look Like this
Now give the outer glow for this curve