adobe photoshop - How to apply a gradient to an Outer glow (example attached)

I want to achieve this sort of an effect on my own. As you can see, there's sort of a non uniform glow (in terms of color) to the text. Simply using the gradient option in the Outer Glow blending option makes the gradient appear from outside the letters to further beyond them. I'm looking for it to appear horizontally as the text continues. I'm using Photoshop CS5. Any tips?