local Lighting = game:GetService("Lighting")

Lighting.FogStart = 5
Lighting.FogEnd = 10
Lighting.FogColor = Color3.new(0,0,0)
Lighting:SetMinutesAfterMidnight(0)

local Top = Instance.new("Part", script)
Top.Name = "Top"
Top.Anchored = true
Top.CanCollide = false
Top.BrickColor = BrickColor.new("Black")
Top.Position = Vector3.new(0,200,0)
Top.Size = Vector3.new(2000*100,1,2000*100)

while true do
    Lighting.FogStart = 5
    Lighting.FogEnd = 10
    Lighting.FogColor = Color3.new(0,0,0)
    wait(0.1)
end