The iconic Artemide Tizio desk lamp has, among other wonderful features, a long life span. On and off we have customers stop by, who are at a loss as to how to change the light bulb in their Tizio, and we immediately know that they most likely have a pre-1992 model. The original Tizio used an automotive halogen lamp. These were not the simple bi-pins we know today, so the head of the Tizio was designed to accommodate the automotive bulb.
The trick is to open the head as shown. The lamp/bulb is removed and replaced from the back.