3505 SIRIO in Perspex in the rare yellow colour, designed in 1970 by Sergio Brazzoli and Ermanno Lampa for Harvey Guzzini and produced in Italy between 1970 and 1985. Other versions: the Harvey Guzzini Sirio lamp was produced in different colors, it can be found in orange, smoky or blue transparent acrylic or a combination of these colors and more rarely in yellow, green, red.