First, here is what I'm talking about (I changed the contrast to make it more visable, since it's not really visible in still images):
Ingore the chat box, I was spamming buttons to see which one took a screenshot :P
Hopefully you can see clearly what I'm talking about. Basically, those lines in the sky (they're only visible in the top part of the image). This seems to occur for me any time I use a still object and move lighting across it (the faster the light, the more the lines are visible to the player). What causes this? It seems to happen in lots of games though (especially in the sky, since it's pretty much still). Is there any way to remove them (I'm not looking for API specific because it seems to occur in all APIs)?