Love this game! The "Letter T" took me forever to get (and only after seeing the hint of "start with a horizontal strip"), but finishing it felt amazing. The levels after the T are much easier in comparison, mostly because "make a horizontal strip" seems to be the first step in a lot of them.
@bruins72 The next step is to find the ID card, which is in the same room as the power and down behind the column with the panel, which located to the right of the doors and the left of the pipes. This card gives you access to the other rooms once the power is green.