Click on the new channel button in the Channels Pallete. Alpha 1 will apper. fill your selection with white, it should resemble the image shown.
Click on the rgb channel at the to of the pallette.
Here is where the magic happens. Filter>Render>Lighting effects.
Use the settings here or play around with your own.
Click on texture channel and load Alpha 1. I deselected the white it high for this example.
Click on the color picker to give your light some color. We used purple.
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