how do i change the transparency of a beam with a script?

for some reason, it won't let me change the transparency of the beam with the script and i just can't put my finger on the reason edit: I've tried using

repeat
beam.Transparency = beam.transparency + 0.05
until beam.Transparency == 1

and removing the "()"

error: "Players.TheRisingTides.PlayerGui.LocalScript:3: bad argument #3 to 21:51:46.122 'Transparency' (NumberSequence expected, got number)" script:

local beam = game.Workspace.lights.Part.Beam
repeat
	beam.Transparency = (0.55)
	wait(0.05)
	beam.Transparency = (0.6)
	wait(0.05)
	beam.Transparency = (0.65)
	wait(0.05)
	beam.Transparency = (0.7)
	wait(0.05)
	beam.Transparency = (0.75)
	wait(0.05)
	beam.Transparency = (0.8)
	wait(0.05)
	beam.Transparency = (0.85)
	wait(0.05)
	beam.Transparency = (0.9)
	wait(0.05)
	beam.Transparency = (0.95)
	wait(0.05)
	beam.Transparency = (1)
	wait(2)
	beam.Transparency = (0.95)
	wait(0.05)
	beam.Transparency = (0.9)
	wait(0.05)
	beam.Transparency = (0.85)
	wait(0.05)
	beam.Transparency = (0.8)
	wait(0.05)
	beam.Transparency = (0.75)
	wait(0.05)
	beam.Transparency = (0.7)
	wait(0.05)
	beam.Transparency = (0.65)
	wait(0.05)
	beam.Transparency = (0.6)
	wait(0.05)
	beam.Transparency = (0.55)
	wait(0.05)
	beam.Transparency = (0.5)
	wait(2)
	until false