In Sulmona, during the historic Good Friday procession, the hand-carried lanterns held by the young members of the Confraternity of the Holy Trinity have been a recognizable symbol for centuries. But behind their elegance lay a concrete issue: the risk posed by fire and glass over more than four hours of continuous use. In 2022, the Confraternity turned to Neri to find a solution that was safe - yet invisible. The result? An LED system powered by a single battery for each lantern, ensuring full autonomy and safety without altering the original appearance. The warm glow of candlelight was precisely recreated thanks to a custom LED filter; the spheres were reproduced in polyethylene using 3D printing, and the golden leaves were carefully restored to their original brilliance.