We all know that with the layer blending mode Screen we can make very nice lighting effects and also we can use Add for a stronger effect.
Well, there is another way to get a better and extra lighting, also there is no need of extra layers.
1.What you have to do is to select Add for the layer blending mode of the layer where we have the shapes that will simulate the lighting, these ones are normally white or near to white.
2.Then here is the trick:
Inside that same layer make a shape totally black and place it at the bottom of the order of the shapes, Shift+arrow down.
Make sure the black shape is big enough so the other shapes can fit inside this one.
Dont worry for the form of the shape because the black color with Add applied just doesnt show
![Very Happy :D](./images/smilies/icon_biggrin.gif)
Render and you will see the result:
Comparition:
![Image](http://fc01.deviantart.net/fs70/f/2010/319/b/4/add_by_parkerx87-d32xf7x.png)
![Image](http://fc00.deviantart.net/fs71/f/2010/319/1/9/sky_by_parkerx87-d32xdkm.png)
Check the animated sky here:
http://www.youtube.com/watch?v=zdafg5uUmXA
Also i will be working on a video tutorial on how to make skys like this one very soon
![Smile :)](./images/smilies/icon_smile.gif)