How to change material script?

Hello!

First of all, you should be constantly checking if it is nighttime, about every second or minute, depending on how fast your day turns out to be.

You can use a while loop for this. Next, you will want to check if the value is 18 or later, you can use >= 18 for this, as it will check if it is 18 or higher. Next, you want to change it to the Neon material, then you will have to use Enum.Material.Neon.

Now, let's turn this logic into code.

local Lighting = game:GetService("Lighting");

-- Our while loop
while true do

-- Checking if the time is 18 or more.
if Lighting.ClockTime >= 18 then

    -- Let's change the lamp's material to Neon!
    script.Parent.Material = Enum.Material.Neon;

    else

    -- Change it to SmoothPlastic if it isn't late :D
    script.Parent.Material = Enum.Material.SmoothPlastic;
end

wait(1) -- Waits a second before continuing
end

I think the problem is that you need to put the material in quotes, like this:

if game.Lighting.ClockTime = 18 then
    script.Parent.Material = "Neon"
end

The issue you had with your script is that you are not supposed to put a material in brackets like that unless you need to use a parameter in a function or a variable when you are trying to reference something like if I were to do this

local Key = "J"
local Thing = Enum.KeyCode[Key]

I hope this helps. If it does not, it is probably because you are not showing us enough of your code. Accept if this helps. Thank you.