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PH 4½-3½ GLASS FLOOR LAMP
PH 4½-3½ GLASS FLOOR LAMP 1

PH 4½-3½ Glass Floor Lamp

Designed by
Poul Henningsen

Product Category:

Lighting - Floor Lamps

  • Product information
  • Materials

PH 4½-3½ Glass Floor Lamp

The PH 4½ family is designed on the principle of a reflecting multi-shade system, producing harmonious and glare-free lighting. The shade design is based on a logarithmic spiral, with the centre of the light source placed in the spiral's focal point.

Poul Henningsen designed the three-shade system back in 1925-1926. The first lights using the system were designed by PH in cooperation with Louis Poulsen for an exhibition in Paris. This partnership continued up until his death in 1967. Throughout his life, PH sought to create glare-free light, direct light where it was most needed, and create soft shadows, using incandescent bulbs as a light source.

PH was the first person to pursue a scientific approach to light and use the logarithmic spiral as a basis. By using a design based on the logarithmic spiral he achieved even distribution of light over the entire curve of the shade. This even light distribution, together with the diffuse reflection through the glass, made it possible to control glare and shadow. Each shade reduces the amount of light equally, due to their distance from the light source. The PH light model numbers refer to the shade size. 

Finishes

White Opal Glass

The fixture is designed based on the principle of a reflective three-shade system, which directs the majority of the light downwards. The shades are made of mouth-blown opal hree-layer glass, which is glossy on top and sandblasted matt on the underside, giving a soft and diffused light distribution.

Dimensions

Shade: 450mm diameter

Base: 300mm diameter

Height: 1250mm

Lead time
12-16 weeks
Good to know
- Poul Henningsen designed the three-shade system back in 1925-1926
- PH 4½-3½ Glass Floor in its current form was introduced in 1990
- The PH light model numbers refer to the shade size. 
- PH Collection includes table lamps, floor lamps and pendants
Glass
Steel