Angelo Lelii (also spelled Lelli), born around 1911–1915 in Ancona and passing in 1979, was a leading figure of 20th-century Italian design. Trained at the ISIA of the Politecnico di Monza, he began designing lamps in the late 1930s, and in 1946 three of his creations were featured in Domus under the direction of Gio Ponti. The following year, he founded Arredoluce in Monza, which soon became a benchmark for modern Italian lighting. His iconic Triennale floor lamp (model 12128), presented at the VIII Triennale di Milano in 1947, secured his early reputation. Lelii was a visionary innovator, introducing halogen technology, low-voltage transformers, and ergonomic details such as the foot switch into his designs. Throughout the 1950s and 1960s, he collaborated with key figures like Gio Ponti, Ettore Sottsass, the Castiglioni brothers, Franco Albini, and Nanda Vigo, while Arredoluce exported his works worldwide. Among his most celebrated pieces are the Stella ceiling lamp, the Eye floor lamp, the sculptural Cobra table lamp, and the striking President Lamp of the 1970s. Combining sculptural elegance, technical ingenuity, and meticulous craftsmanship, Lelii’s creations remain highly sought after by collectors today, often achieving record prices at auction and securing his place as an icon of modern Italian design.