PH 2/1 Pendant Lamp
The PH 2/1 Pendant Lamp is a member of the PH3-shade product family. The PH 3-shade system was initially a pendant lamp solution but quickly became an example for other types of lamps for tables, floors, walls and a large number of chandeliers. As a result of the different sizes, materials, surfaces and light sources, more than a thousand versions have been developed over the years.
Reflecting Layer Shade System
A classic amongst the variants is the PH 2/1 Pendant Lamp. It is based on the principle of a reflecting multi-shade system with glare-free illumination. The shape of the shade is based on a logarithmic spiral whose focus is a light source. This is how the 2/1 creates soft light.
The PH lamps were designed as a rational lighting system where the size of the lampshade, its material and its surface can be combined depending on the purpose. All upper shades have a respective number of middle and lower shades so that the proportions between the shades stay in an approximate relation of 3:2:1. Each shade reduces the amount of light.
Product Family by Poul Henningsen
One of the original ground models was a PH 5/5. The first number shows the approximate diameter of the shade, the second one, behind the dash, shows that the middle and lower shades were made for the upper one. This means that the 5/5 has an upper shade of 50, a middle shade of 31 and a lower shade of 15.5 centimetres in diameter. This combination was good for lamps that were designed to be hung from high ceilings. But if you need it for a lower ceiling, a combination of large upper and smaller middle and lower shades would be useful. This is how the PH 2/1 emerged.