How do you make a map dark ?

[k772]

how do you make a map dark, yes i tried just changing the textures and i did but the bots-zombies are light,or simply how do you make a map dark like destruct?

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[Deathwishez]

Change the sun light and ambient light.

[k772]

Change the sun light and ambient light.

what do i change them to what ever i do makes it lighter

[Deathwishez]

Lower the numbers?