Why is the neon not turning into Concrete, then at night turning back to Neon?

I have Crazyman32's Day/Night script and so I made this script, when it's night these bricks will turn neon and during day to concrete, but it isn't working. Help!

local brickred1 = game.Workspace.("RED")
local brickred2 = game.Workspace.("RED2")
local brickwhite1 = game.Workspace.("WHITE")
local brickwhite2 = game.Workspace.("WHIT2")


 while wait() do  
  local lighting = game:GetService("Lighting")
   if lighting.TimeOfDay >= "18:00:00" then
    --This is where the bricks will start to change in material
   brickred1.Material = "Neon"
   brickred2.Material = "Neon"
   brickwhite1.Material = "Neon"
   brickwhite2.Material = "Neon"

    else
     if lighting.TimeOfDay <= "05:00:00" then
      --This is where the bricks will go back to concrete because it's daytime
      brickred1.Material = "Concrete"
      brickred2.Material = "Concrete"
      brickwhite1.Material = "Concrete"
      brickwhite2.Material = "Concrete"

      --Right here is the code that checks if anything is not working
      --To check if it broke or not, just press F9 and go through each of the tabs
    if lighting.TimeOfDay <= "05:00:00" and brickred1.Material == "Concrete" then
      local val = Instance.new("NumberValue",script.Parent)
     val.Value = val.Value + 1
       if val.Value + 1 then
        print("looping + 1")
     if not val.Value + 1 then
       print("looping - 1 and it broke.")

end
 end
   end
 end