Illuminated Texture Mask

I have a texture with some small lit areas. The problem is that when I put these textures into the engine the sun lights them. This is fine but it makes the "illuminated" portions of my texture darker and well less illuminated.

Is there any way to create a mask or channel that would say, "Don't light this part of the texture"?

I know you can place an actual light next to each one of these lit areas but it is a tiling texture and there a ton of instances of it in the level, so it would not be practical.

Thanks