List of skies
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This is a list of skies available in 
Source and 
GoldSrc engine games, along with pictures of each skybox. The light_environment settings listed (Ideal Sun Angle, Ideal Brightness, etc) are suggestions based on settings used in official maps; other values may also be appropriate. To test skies in singleplayer without recompiling the map, bring up the console and enter sv_skyname <sky_name>. Quicksave the game, load it again and the old skybox should be temporarily replaced with the new one.
Note:If you are mapping for 
Half-Life 2: Episode Two, you need to add _hdr to the end of most sky names—if it is not already there—so it does not cause the sky texture to stretch. (So, if your sky name is sky_day01_01, you would make it sky_day01_01_hdr).
Tip:Search "sky" in the texture browser within Hammer to see some of the skyboxes available in the game you are mapping for.
Warning:Most of the images on this page only show the skybox sides (left, right, front, back). Skyboxes have much more detail on the top, which may not be accurately reflected on this page; view the skybox in-game or in 
to get a better idea of how a sky looks.Prefabs with light presets for Source Engine
These prefabs contain most of the above light presets for Valve Source-games.