How can I make this script work online?

function whenClicked()
	local wait = workspace:WaitForChild("Player")
	local playerpos = game.Workspace.Player.Torso.Position
	local leftlightpos = game.Workspace.FlashLight1.Union.Position
	local difference = playerpos - leftlightpos
	local number = 50
	if difference.magnitude < number then
		local xyzb = game.Workspace.FlashLight1.Union.PointLight
		xyzb.Range = 45
	end
end

script.Parent.MouseButton1Down:connect(whenClicked)

Basically, the problem I have here is that this script only works in Roblox Studio because a child called "Player" loads in to the game on test mode. However, online "Player" would be registered as the name of the user playing the game, for example if Shedletsky joined my game, "Player" = "Shedletsky". The real problem is that I do not know how to register every single player within this code, except from one person. This theory is correct, because I changed "Player" to "EmperorTerminus" and then I went online and the script seemed to be working but it will not work for everyone else because their name will not be included within the script. Any ideas?