Light Ring V2

-- SETTINGS
local numParts = 8 -- number of parts
local partDepth = 4 -- initial Z size
local partHeight = 1
local travelDistance = 50 -- studs to move forward
local animationTime = 3 -- seconds to complete movement
local lightRange = 20
local lightBrightness = 2

-- SETUP
local model = script.Parent
for _, obj in ipairs(model:GetChildren()) do
	if obj:IsA("BasePart") then
		obj:Destroy()
	end
end

local parts = {}
for i = 0, numParts - 1 do
	local angle = i * (2 * math.pi / numParts)

	local part = Instance.new("Part")
	part.Anchored = true
	part.CanCollide = false
	part.Size = Vector3.new(0, partHeight, partDepth) -- width will change
	part.CFrame = CFrame.new(0, 0, 0) * CFrame.Angles(0, -angle, 0)
	part.Parent = model

	local light = Instance.new("SurfaceLight")
	light.Face = Enum.NormalId.Front
	light.Angle = 360 / numParts
	light.Range = lightRange
	light.Brightness = lightBrightness
	light.Parent = part

	table.insert(parts, {
		part = part,
		angle = angle
	})
end

-- ANIMATION
local runService = game:GetService("RunService")
local startTime = tick()

local connection
connection = runService.Heartbeat:Connect(function()
	local elapsed = tick() - startTime
	local alpha = math.min(elapsed / animationTime, 1)
	local r = alpha * travelDistance

	for _, data in ipairs(parts) do
		-- Calculate width so edges touch
		local width = 2 * r * math.sin(math.pi / numParts)
		if width < 0.05 then width = 0.05 end -- prevent zero size

		-- Update size
		data.part.Size = Vector3.new(width, partHeight, partDepth)

		-- Position outward along local Z axis
		local pos = CFrame.new(0, 0, r) -- move along local Z
		data.part.CFrame = CFrame.Angles(0, -data.angle, 0) * pos * CFrame.Angles(0, -data.angle, 0)
	end

	if alpha >= 1 then
		connection:Disconnect()
	end
end)