Cant change colour of tint screen?

Trying to make an input change the colour of the screenstint, nothing to difficult though this is my first time doing this and i cant figure it out

local ui = game.StarterGui.HUD
local screen = game.Lighting.Screen

local Open = true

local UserInputService = game:GetService("UserInputService")

UserInputService.InputBegan:Connect(function(keyCode)
    if keyCode.keyCode == Enum.KeyCode.V then
        if Open then
            Open = false
            ui.Enabled = false
            wait(0.5)
            screen.TintColor = "0, 0, 0"
        else
            Open = true
            screen.TintColor = "212, 235, 255"
            wait(0.5)
            ui.Enabled = true
        end
    end
end)