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)