Abstract: A LED illuminating arrangement with a plurality of illuminating devices connected in parallel with wires aligned at a one-plane manner. The illuminating device comprises a shell formed by injection molding of ABS plastic, an illuminating unit and a sealing arrangement. The shell has a top side, two sidewalls defining two guiding slots for wires passage and one or more chambers indented from the top side. The illuminating unit includes a printed circuit board and one or more diodes mounted on an exposed portion of the circuit board within the chamber in series for providing illumination. The sealing arrangement is made of thermosetting polymer sealing at each chamber, protecting the diode and the exposed portion of the circuit board against water.