how can I remove the light in sky swbfii
First you need to learn basics of mod tools, mainly how to recompile an existing world. When you reach the point of understanding that, get the world you want to edit, and in the "world1" folder (world2, world3, etc) you will see a file with the .sky extension. open this file in notepad, and there you can see certain settings for things. also see the file with a .fx extension, it also can control sky stuff.