Fullbright

local Lighting = game:GetService("Lighting")

local function bafd()
    Lighting.Ambient = Color3.fromRGB(255, 255, 255)
    Lighting.OutdoorAmbient = Color3.fromRGB(255, 255, 255)
    Lighting.Brightness = 1
    Lighting.GlobalShadows = false
    Lighting.FogStart = 99e9
    Lighting.FogEnd = 99e9
    Lighting.FogColor = Color3.fromRGB(255, 255, 255)
end

bafd()

Lighting:GetPropertyChangedSignal("Ambient"):Connect(bafd)
Lighting:GetPropertyChangedSignal("OutdoorAmbient"):Connect(bafd)
Lighting:GetPropertyChangedSignal("Brightness"):Connect(bafd)
Lighting:GetPropertyChangedSignal("GlobalShadows"):Connect(bafd)
Lighting:GetPropertyChangedSignal("FogStart"):Connect(bafd)
Lighting:GetPropertyChangedSignal("FogEnd"):Connect(bafd)
Lighting:GetPropertyChangedSignal("FogColor"):Connect(bafd)