When I test my day and night light script, it doesn't work, why?

So I made a simple light script for day and night, but when I try this, it doesn't work. I don't see any errors or something.

Light1 = script.Parent.Light1
Light2 = script.Parent.Light2
if game.Lighting.ClockTime == 5 then
	Light1.Material = Enum.Material.SmoothPlastic
	Light2.Material = Enum.Material.SmoothPlastic
	Light1.PointLight.Enabled = false
	Light2.PointLight.Enabled = false
end

if game.Lighting.ClockTime == 22 then
	Light1.Material = Enum.Material.Neon
	Light2.Material = Enum.Material.Neon
	Light1.PointLight.Enabled = true
	Light2.PointLight.Enabled = true
end

I'm working on a new update, so I want to make this update pretty awesome.

Ok so, though you could loop through forever to do this that is not as performance friendly as just detecting when the time changes using GetPropertyChangedSignal which will detect when the time changes and do whatever it is you want to be done accordingly.

Here is a fix for your code using GetPropertyChangedSignal I also changed your conditional statements from == to >=. It might be worth taking the time to set a variable for if the lights are already turned on so that each clock change isn't trying to set the materials and pointlights to what they already are.

local Light1 = script.Parent.Light1
local Light2 = script.Parent.Light2
local Lighting = game:GetService("Lighting")

local function timeChanged() --Function for changing your parts
	if Lighting.ClockTime >= 18 then --Is it night?
	    Light1.Material = Enum.Material.Neon
    	Light2.Material = Enum.Material.Neon
    	Light1.PointLight.Enabled = true
    	Light2.PointLight.Enabled = true	
	elseif Lighting.ClockTime >= 6 then --Is it day?
	    Light1.Material = Enum.Material.SmoothPlastic
    	Light2.Material = Enum.Material.SmoothPlastic
    	Light1.PointLight.Enabled = false
    	Light2.PointLight.Enabled = false	
	end
end

Lighting:GetPropertyChangedSignal("ClockTime"):Connect(timeChanged) --Detect when the ClockTime Changes

Keep in mind for this code to work changing the slider in studio wont effect anything, you need to have a script in game manually changing your clocktime for this to be effective. I have included one below for testing the script, this one is extremely fast and if you want to use it I would advise lowering the rate of change.

while wait(0.1) do -- Change 0.1 to higher numbers to change the rate it changes the value
    game.Lighting.ClockTime =  game.Lighting.ClockTime + 0.1 -- Change 0.1 to change the amount of value changed each time
end