In my opinion, If the 1804tc's have the same circuit design as the bullet 1804's. Then the tc's work at 12v with no problem. The problem is then in the pcb design, the injection molded process, lack of conformal coatings, and possible shortcuts for costs and/or production time. So far the ones I have failed have been due to poor pcb design ie the data pcb pad is too close to the 12v pad. Any moisture that is inside the pixel causes a semi conductive path that takes out the 2811 chip in the previous and dead pixel. I have one string that has this problem. I replaced 6 chips already. Unless someone does extensive testing on the new design pixels, including dis assembly to see if can have any issues, I would not buy any of them.