Windlight entry on the secondlife wiki:
WindLight is the codename for Second Life’s atmospheric rendering system that enhances skies, lighting, and other graphical aspects of the environment. “WindLight” is commonly used by Residents to refer to photographs and machinima that include such effects.
When starting out its essential to have a good selection of windlight settings then you can move onto creating your own as you need them.
Strawberry Singh has a thorough article about Windlight Settings, make sure to check that out before you continue.
Read the article and try some of the settings as you go. I’m not taking credit for these settings but you can download my collection of windlight settings.
Basically you download the files and copy them to your viewers setting folder, for each operating system its in a different location. If they are in a zip archive extract them first. It should be an xml file.
Where to copy them:
Linux – /home/USERNAME/.firestorm/user_settings/windlight/skies
Windows XP – C:\Documents and Settings\USERNAME\Application Data\Firestorm\user_settings\windlight\skies
Windows Vista & 7 – C:\Users\USERNAME\AppData\Roaming\Firestorm\user_settings\windlight\skies
Mac – use Go menu > Go to Folder and paste in: ~/Library/Application Support/Firestorm/user_settings/windlight/skies
If you are using a third party viewer such as Inworldz viewer, remember to place the settings in the correct folders by substituting the “Firestorm” folder for the name of the viewer you are using.
The way I keep my settings tidy is to rename them starting with numerals for example “00_StrawberrySinghHeadshots.xml” and “01_StrawberrySinghLightUpMySLife.xml”, putting 00 and 01 at the front of the file name means when I access the windlight menu that all my favourites will be at the top of the menu.
If you want to modify the default list of windlight settings that comes with your viewer, find where it is installed and look in the “app_settings/windlight/skies” folder.