arm = workspace.DoogleFox["Left Arm"] 
light = Instance.new("PointLight", arm) 
light.Color = Color3.new(0.8,0,0) 

while true do 
for i = 1, 20 do 
arm.Transparency = 0.05*i
light.Brightness = 0.1*i
wait(0.02) 
end 
for i = 20, 1,-1 do 
arm.Transparency = 0.05*i
light.Brightness = 0.1*i
wait(0.02) 
end 
end