I made script with the function that I want to go loop. How do I do this?

I'm learning at scripting and I made function that I want to loop but how do I do this? I added while true do then the script ended up not working. What should I do?

local light = game.Workspace.Lights

function onClicked()
	light.Sound:Play()
	light.Red.Material = "Neon"
	light.Blue.Material = "Plastic"
	light.Red.PointLight.Enabled = true
	light.Blue.PointLight.Enabled = false
    wait(0.5)
	light.Blue.Material = "Neon"
	light.Red.Material = "Plastic"
	light.Red.PointLight.Enabled = false
	light.Blue.PointLight.Enabled = true
end



script.Parent.TextButton.MouseButton1Down:connect(onClicked)

Basically I want the function to loop when you click the GUI that I made.