Universal Realistic Lighting SOURCE

local lighting = game:GetService("Lighting")
local tool = Instance.new("Tool", game:GetService("Players").LocalPlayer.Backpack)
local part = Instance.new("Part", tool)
local spotlight = Instance.new("SpotLight", part)
tool.LevelOfDetail = "StreamingMesh"
tool.ToolTip = "Light"
tool.Name = "Light"
tool.ModelStreamingMode = "Atomic"
tool.RequiresHandle = true

part.Material = "SmoothPlastic"
part.Reflectance = 1
part.Size = Vector3.new(1, 1, 1)
part.CanCollide = false
part.Name = "Handle"
part.Anchored = false
part.Massless = true
part.Shape = "Ball"

spotlight.Angle = 90
spotlight.Brightness = 5
spotlight.Color = Color3.fromRGB(255, 255, 255)
spotlight.Face = "Front"
spotlight.Range = 16
spotlight.Shadows = true

lighting.Ambient = Color3.fromRGB(0, 0, 0)
lighting.Brightness = 3
lighting.ColorShift_Bottom = Color3.fromRGB(0, 0, 0)
lighting.ColorShift_Top = Color3.fromRGB(0, 0, 0)
lighting.EnvironmentDiffuseScale = 1
lighting.EnvironmentSpecularScale = 1
lighting.GlobalShadows = true
lighting.LightingStyle = "Realistic"
lighting.OutdoorAmbient = Color3.fromRGB(0, 0, 0)
lighting.Outlines = true
lighting.PrioritizeLightingQuality = true
lighting.ShadowColor = Color3.fromRGB(0, 0, 0)
lighting.ShadowSoftness = 0.125
lighting.Technology = "Future"
lighting.ExposureCompensation = 0