If, True, False statements not working for light system? [ANSWERED]

You just made 1 simple mistake, which I have learned from making many times myself. You used the wrong event for the ClickDetector. MouseButton1Click is an event for GUI Objects, such as a TextButton, whereas the event you are looking for is MouseClick.

To fix it, we'll simply swap that out with the correct event, and your code should work:

local light1 = script.Parent.Parent.L1.SpotLight
local light2 = script.Parent.Parent.L2.SpotLight

function onClicked(mouse)
	if light1.Enabled == false and light2.Enabled == false then
		light1.Enabled = true
		light2.Enabled = true
		light1.Transparency = 1
		light2.Transparency = 1

	elseif light1.Enabled == true and light2.Enabled == true then --Also I simplified this by switching it to an elseif statement. Feel free to use the code with or without this
		light1.Enabled = false
		light2.Enabled = false
		light1.Transparency = 0
		light2.Transparency = 0

	end
end

script.Parent.ClickDetector.MouseClick:connect(onClicked)

And now this should work!

If you have any further problems/questions, please leave a comment below and I'll see what I can do. Hope I helped :P #####Also, as Cheeky pointed out above, it would be simpler to just use an elseif instead of using two different if statements. It's more convenient, and allows the code to run smoother.