This wall-mounted task lamp by German studio 45 Kilo is adjusted simply by sliding a leather loop along the arm that supports its shade.

A diagonal wire spanning from the top of the wall-mount to the head of the Hallo Light allows the arm to rest at 90 degrees, but sliding the leather loop along traps the wire against the arm and brings it closer to the mounting.

The designers were inspired by the simplicity of the classic Potence light by Jean Prouvé and set out to make an adjustable version.

45 Kilo comprises Philipp Schöpfer and Daniel Klapsing, who attended the Blickfang Design Workshop in Copenhagen last week. Designers at the workshop were given product and business development advice by a curatorial panel made up of designers Jaime Hayon and Saskia Diez and journalists Eva Steidl and Dezeen editor-in-chief Marcus Fairs.

We were there to film interviews with participants so watch out for movies from the workshop on Dezeen soon. Meanwhile you can see photos from the workshop on our Facebook page and watch our movies from last year's workshop here.

See more stories about lighting on Dezeen »

Here's some more information from the designers:

The Hallo Lights were inspired by Jean Prouvé's Potence light. We admire the lightness and elegance of it, though we see some obvious shortcomings in its functionality. This is why we reworked the idea of this lamp as we wanted to create a functional yet simple wall mounted light for workplaces.

The main idea was to add the possibility of changing the height of the head and to have a concentrated spot light instead of an overall lighting. Yet we wanted to create something that is as minimal and light as the predecessor.

Luckily we found a very simple solution for the height-changing mechanism. It consists of a wire that is attached to the head and the wall piece which leads through a leather strap. The height can then be changed by moving the strap along the arm.

Above: Potence light by Jean Prouvé, which inspired the design