Louis Poulsen is a Danish lighting company that is renowned for its bold and innovative designs. One of its most iconic creations is the Question Mark Lamp, which has been a symbol of the company since it was first introduced in 1958. This lamp is known for its unique shape and functionality, and it has become a favourite among architects and designers around the world. In this article, we will discuss the design and functionality of Louis Poulsen’s Question Mark Lamp in detail.

History and Design

The Question Mark Lamp, also known as the PH50, was designed by Poul Henningsen, a Danish architect, designer, and writer. Henningsen was known for his work in lighting design, and he created the Question Mark Lamp as a pendant light that would provide direct and diffused light. The lamp is made up of a single piece of spun aluminium, which is shaped into a curved, question mark-like form. The lampshade is painted white on the outside and has a matte finish on the inside, which helps to reflect light evenly in all directions.

The unique shape of the Question Mark Lamp is not just for aesthetics; it also serves a functional purpose. The curved form of the lampshade directs the light downwards and at the same time, creates a soft, diffused light that is evenly spread throughout the room. This means that the lamp can be used as both a task light and an ambient light, making it a versatile addition to any space.


The Question Mark Lamp is designed to provide direct and diffused light, which means that it can be used in a variety of settings. The lamp is especially useful in spaces where a combination of task and ambient lighting is needed, such as in a home office or living room. The lamp is also popular in commercial settings, such as restaurants and hotels, where it can be used to create a warm and inviting atmosphere.

Another benefit of the Question Mark Lamp is its energy efficiency. The lamp uses an LED bulb, which is both long-lasting and energy-efficient, making it a cost-effective lighting option. The LED bulb also emits less heat than traditional incandescent bulbs, which means that the lamp can be used for longer periods without overheating.

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