if attribute is certain number then set transparncy not working how fix?

I am trying to check if a attribute is 0 or 1 or all the way to 15. and then set transparency but it isnt working. how do i fix this?

FOUND OUT THAT THE TRANSPARENCY IS NOT WORKING the attrbiute detection works ok but transparency doesnt change

local Wire = script.Parent
local Strength = script.Parent.unpowered.Transparency

function setSignal()
	if Wire:GetAttribute("SignalStrength") == 0 then
		Strength = 0
	end
	if Wire:GetAttribute("SignalStrength") == 1 then
		Strength = 0.0667*1
	end
	if Wire:GetAttribute("SignalStrength") == 2 then
		Strength = 0.0667*2
	end
	if Wire:GetAttribute("SignalStrength") == 3 then
		Strength = 0.0667*3
	end
	if Wire:GetAttribute("SignalStrength") == 4 then
		Strength = 0.0667*4
	end
	if Wire:GetAttribute("SignalStrength") == 5 then
		Strength = 0.0667*5
	end
	if Wire:GetAttribute("SignalStrength") == 6 then
		Strength = 0.0667*6
	end
	if Wire:GetAttribute("SignalStrength") == 7 then
		Strength = 0.0667*7
	end
	if Wire:GetAttribute("SignalStrength") == 8 then
		Strength = 0.0667*8
	end
	if Wire:GetAttribute("SignalStrength") == 9 then
		Strength = 0.0667*9
	end
	if Wire:GetAttribute("SignalStrength") == 10 then
		Strength = 0.0667*10
	end
	if Wire:GetAttribute("SignalStrength") == 11 then
		Strength = 0.0667*11
	end
	if Wire:GetAttribute("SignalStrength") == 12 then
		Strength = 0.0667*12
	end
	if Wire:GetAttribute("SignalStrength") == 13 then
		Strength = 0.0667*13
	end
	if Wire:GetAttribute("SignalStrength") == 14 then
		Strength = 0.0667*14
	end
	if Wire:GetAttribute("SignalStrength") == 15 then
		Strength = 0.0667*15
	end
end

while true do
	setSignal()
	wait()
end

You're saving a variable Strength which holds the transparency value, however when you change the variable you do not change the transparency value. You should change the transparency value directly:

script.Parent.unpowered.Transparency = 0.0667

It's also worth noting that you can compress all of the if statements into a single line by treating the transparency value as a linear function:

script.Parent.unpowered.Transparency = 0.0667 * Wire:GetAttribute("SignalStrength")

It's also a better idea to make your code event based by connecting to GetAttributeChangedSignal instead of constantly looping:

Wire:GetAttributeChangedSignal("SignalStrength"):Connect(setSignal)

Use GetAttributeChangedSignal().

Wire:GetAttributeChangedSignal("SignalStrength"):Connect(function()
   if Wire:GetAttribute("SignalStrength") <=0 then
      Wire.unpowered.Transparency = 0
   else
      Wire.unpowered.Transparency = 0.0667 * Wire:GetAttribute("SignalStrength")
   end
end)