Close-up of the PH Septima pendant, showing its layered transparent glass shades. © 2026 Louis Poulsen.

How to spot an original Louis Poulsen lamp

Louis Poulsen: A Legacy of Craftsmanship


Since 1874, Louis Poulsen has been shaping exceptional light through meticulous craftsmanship and innovative design. Rooted in Danish traditions, high-quality materials are used to create lighting that enhances spaces and elevates everyday experiences.

A PH Artichoke and PH 5 pendants hang in a historic showroom as a man examines a lampshade. © 2026 Louis Poulsen.
A PH Artichoke pendant hangs in a glass-walled apartment overlooking the New York skyline. © 2026 Louis Poulsen.
A glassblower shapes hot, clear glass in a workshop. © 2026 Louis Poulsen.

THE PH SYSTEM

   

PH 4½-3½ Floor Lamp with white shades and brass details against a dark background. © 2026 Louis Poulsen.
Vintage illustration of multi-shade PH lights shown as pendants, wall lights and a floor lamp. © 2026 Louis Poulsen.

Developed by Poul Henningsen in the 1920s, the PH system uses a groundbreaking logarithmic spiral design to optimize light distribution. This system minimizes glare while enhancing functionality and aesthetics, with unique shade combinations like PH 3/2 or PH 6/5, offering tailored light diffusion. The numbers in the PH lamp represent a fraction of the diameter (in centimeters) in the top two shades, meaning the 3/2 is 30 centimeters across on top, and 20 centimeters across in the middle.

Made with mouth-blown opal glass from Italian artisans, the precision-engineered shades ensure consistent angles of light reflection, providing elegant and efficient illumination.

To spot a fake Poul Henningsen glass lamp, check for the Louis Poulsen logo, which fakes may either lack or poorly imitate. Genuine lamps have high-quality, mouth-blown glass with a smooth finish and substantial weight, while counterfeits use cheaper, lighter material. Compare the lamp’s proportions to official specs, as fakes may have slight discrepancies. Be wary of unusually low prices and generic packaging, as authentic lamps come with branded packaging and proper documentation.

A PH Artichoke pendant with copper-coloured leaves casts a warm glow above a staircase. © 2026 Louis Poulsen.