I’m trying to render a sunset on an alien planet. I’ve got the sky colors set up, but when I check the “sun” box on my sunlamp, it overrides my sky and changes it to a blue and yellow sky.
The first render I enclosed shows the sky without the sun box checked, and the second with.
Assuming you’re using a Blend Sky, you can probably get a better result by modifying the Sun/Sky blending mode and other values. The attached .blend shows a few setting for a much different effect than the default, and one that matches the file’s Blend Sky more closely. Play with it.