15. Click on the Mountains layer. Filter > Render > Lighting Effects...use the setting in the attached image. Here we have one spotlight coming in from the bottom right. Intensity is 13, Focus is 100, Gloss is 100, Material is 100, Exposure is 0, Ambience is 8, Texture Channel is Red, “White is high” is checked, and Height is all the way up to 100. Lastly, set the layer's blend mode to overlay.

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