Advanced Glowing Text
More advanced glowing text effects can be created by building on this simple principle. Once you've started to create your own glowing text by applying the "Outer Glow" layer attribute, you can add a secondary glow with ease.
This secondary glow is created by selecting the "Drop Shadow" layer attribute, then making adjustments to the blend mode and other attributes to match those of your glow. You can then change the color to that which you want to use for your secondary glow, causing the "shadow" to appear in the glowing color of your choice.
Adding a secondary glow isn't the only way that you can enhance your glowing text, however. Create a new layer beneath your text layer and start adding "decorators"... lines, images, or even small dots created with the brush tool in the same color as your text.
Right-click on your text layer and select "Copy Layer Style" to copy all of the attributes you've set for your text layer, then right-click on the decorators layer and choose the "Paste Layer Style" option to set them for this layer as well. Adjust the opacity of the layer to give it a fade effect, or create multiple decorators on different layers so that you can fade them separately. This will not only add glow to your image, but if used properly may even add depth.
Image Credits: All screenshots and images by J. Edward Casteele.