How Do I turn a Custom Map To Night Using F11?

[C00LGIRL]

I've been looking and havent yet found a way to change my custom map to night time.
Could someone please help me

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[Mega-Bear]

You need to edit the map's lighting. In Ostinyo's Mapping Tutorial it's explained under the Sky section.

[Pass]

I think you will also need a new skybox for the sky to look like it is night or you will have a bright sky with dark lighting.