My name is Simon Simos. I am a lighting designer and architect, and I designed the light of the facades of the SPG building in Geneva. There were three technical challenges for the lighting supplier. First, we had to make a very thin LED luminaire, IP67, in order to obtain the right specific lighting effect we desired. Secondly it should be almost invisible from street view. And thirdly to insert that in a very small space between double lamellas, which was only 45 millimeters wide. In such a glazed building the main concern about light was daylight, so we had to find a way to control the multiple interreflections of light between the lamellas, avoiding any glaring problems inside the building. After detailed study we came to the conclusion that we had to use the printed glass in order to avoid that glaring problem, and for that we used small white squares in order to deflect the natural light. The client asked me to make different scenarios or different lighting scenes for the facades of the building, in order for the people passing by to see different aspects or different images of that building. So we created about ten to fifteen different scenes by using a custom-made software – and very easy to use by the client himself. If we go into the technical details, 2900 glazed lamellas were used with different depths of 20cm, 40cm and 60cm. 290 lighting fixtures made by ERCO were fixed and the color temperature is warm white – 3000K. Well the question is, how did we decide to place these luminaires? It’s a kind of, I would say, aesthetic intention in order to obtain a nice aesthetic result. ERCO was chosen because it has a very good and solid reputation, and when you develop a new lighting fixture, you have to be absolutely sure that you can count on the manufacture company.