Once studied the kind of structure we would have illuminated, our team of specialists thought to use two led strip bands for each arm, internally assembled. In this way the led strips would not have generated shadows, without interfering with the internal structure. Moreover, the double strip would have allowed to obtain proper brightness as requested. The employed strips are RGB type at 24 volts controlled by DMX control units. Within the structures 2,000 meters of led have been assembled.