How do you darken a player's screen?

So, in a game I'm making I have these different pads going into a tunnel with Touched scripts. How do I make it so that each pad going in turns your screen darker the deeper you go into it?

EDIT- This is the current script- What can I add to make the screen turn dark rather than the place? So that only the player that steps on a pad gets their screen blacked out?

function onTouched(Touch)
	
game.Lighting.Ambient = Color3.new((240/255), (240/255), (240/255))
game.Lighting.Brightness = 0.98

end

function Soundy(Part)
	
game.Workspace.Sound.Pitch = .98 -- Changing pitch of the song that's playing ingame
	
end

script.Parent.Touched:connect(onTouched)
script.Parent.Touched:connect(Soundy)

If you don't understand what I'm saying, just comment so, and I'll try to rephrase.

Assuming your script is a normal script, it will change Lighting's properties for every client as Pyrondon said. If you would still prefer the dimming, but want each player to have their own effects, instead of using a screen-sized frame that goes opaque after awhile, you can learn about Filtering Enabled

F.E. helps prevent exploiters and at the same time allows neat client-side effects like the client-side ambience dimming you're looking for. If you have F.E. enabled in "Workspace" then you can wrap your functions into Remote Events like so:

Touchy = Instance.new("RemoteEvent",game.ReplicatedStorage)
Touchy.Name = "ClientDimmer"
Soundy = Instance.new("RemoteEvent",game.ReplicatedStorage)
Soundy.Name = "ClientSounder"

Touchy.OnClientEvent:connect(function()
	game.Lighting.Ambient = Color3.new((240/255), (240/255), (240/255)) --You can remove the inner parenthesis per RGB value but it's okay to leave them there for preference.
	game.Lighting.Brightness = 0.98
	--[[
	If you plan on decreasing brightness in increments, do game.Lighting.Brightness = game.Lighting.Brightness - (WHATEVER INCREMENT)
	Careful though, directly copy pasting my code will let you rapidly drop brightness by touching the pad over and over.
	]]
end)
	
Soundy.OnClientEvent:connect(function()
	game.Workspace.Sound.Pitch = .98
	--Do you mean to play this sound or just change its pitch?
end)

I would prefer to store the above code in a Script located in "ServerScriptService"

script.Parent.Touched:connect(function(hit) --You can use one event to call both functions!
	local player = game.Players:GetPlayerFromCharacter(hit.Parent)
	if player == nil then return end
	game.ReplicatedStorage.ClientDimmer:FireClient(player) --Run touchy
	game.ReplicatedStorage.ClientSounder:FireClient(player) --Run soundy
end)

^ And put that script inside the pad(s)

tl;dr I did it for you, dissect my script(s) so you can do it too!