It seems I didn't follow up with a reply to the wiring. I would follow the wires coming from the light fixture and switching psu and splice those to the extension cable before it goes to the Iso transformer.
Well I ended up getting the picture on the tube and pretty close to the right size but after changing the width cap there is a resistor that gets super hot in seconds. Can't hold my finger on it more than a second without getting burned really bad. It also started shitting down etc. The tube is on the side right now not being used actually. Wish I could figure out what to do with it really.. =/