Louis Poulsen PH 4½-3½ Glass Table Lamp - POU-5844901253

Louis Poulsen PH 4½-3½ Glass Table Lamp - POU-5844901253

PH 4½-3½ Glass Table is a member of the three-shade family and is one of 19 versions available today. Approximately one thousand different models have been produced over the years and consisted of table, floor and wall lamps, as well as a number of different chandeliers, which were popular in the 30s for lighting private homes with high ceilings. There were countless combination options. The lights were available in different colors, as well as a range of sizes. The first shades were made of metal with a painted undersurface, such as white, gold, or silver, depending on whether diffused, warm or cold light was desired. Glass was later introduced for the three-shade system.

In addition to the downward-directed light, glass lamps illuminated the room. 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 an 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. Each top shade had a corresponding set of middle and lower shades. In the pure models, such as the 2/2, the top shade has a size of about 20 cm (7.87 inch), with corresponding lower shades. PH 4½-3½ Glass Table consists of an approximately 45 cm (17.71 inch) top shade but uses lower shades from the 3½ model. These hybrid models were introduced due to the desire to hang pendants at lower heights. The system was also used for wall, table, and floor lamps. PH 4½-3½ Glass Table in its current form was introduced in 1990.

Designed by Poul Henningsen.

Materials

• Base: High luster chrome plated, spun brass. 
• Shades: Hand blown white opal glass.
• Anti-glare ring: Purple, spun aluminum.
• Top plate: High luster chrome plated, spun brass.
• Stem: High luster chrome plated, steel.
• Class: cULus, Dry location.
• Cord type: Black.
• Cord length: 9’.
• Switch: In-line on/off switch provided.

Dimensions

 21.7 H x 17.7 Dia. inches; Weight: 20.4 lbs

Light Source

15W A-19/IF medium US, 120V

What our Experts Think

• Classic Danish Design: Originally based on Poul Henningsen’s 1920s system, this table lamp blends historical charm with timeless modernity.

• Glare-Free Light: Its layered, hand-blown opal glass shades softly diffuse light, reducing glare and enhancing atmosphere.

• Premium Build: Made with high-luster chrome-plated brass and steel, paired with elegant opal glass for a refined look.

• Elegant Proportions: Stands at 55 cm tall with a 45 cm shade diameter, offering a perfect balance of form and function.

• Practical: Comes with a 2.7-meter cord and in-line switch for easy use on desks, bedside tables, or sideboards.

• Warm and Functional: Supports an E27 bulb up to 100W, delivering ample, comfortable light for both task and ambient use

Q&A

Q: What is the Louis Poulsen PH 4½-3½ Glass Table Lamp?
A: A timeless table lamp featuring Poul Henningsen’s 3-shade system with handblown opal glass for soft, glare-free illumination.

Q: What materials is it made from?
A: Mouth-blown white opal glass shades with a high-lustre chrome-plated brass base and stem.

Q: What type of bulb does it use?
A: E14 bulb, max 40W, LED compatible.

Q: Where is it best suited?
A: Ideal for desks, side tables, and refined interiors needing ambient or task lighting.

Maintenance Tips

• Regular Dusting
  Gently dust the lamp's opal glass shades and chrome-plated base with a soft, dry cloth to maintain its appearance.

• Gentle Cleaning
  For greasy spots, use a soft cloth dampened with lukewarm water (below 122°F/50°C) and a mild detergent. Avoid scouring powders or similar substances, as they can scratch surfaces.

• Avoid Abrasive Cleaners
  Never use detergents containing abrasives or solvents, as they can damage the lamp's finish.

• Dry After Cleaning
  After cleaning with a damp cloth, ensure the lamp is thoroughly dried with a soft, dry cloth to prevent moisture damage.

• Use Appropriate Bulbs
  Do not use half mirror light bulbs, as they can reflect heat and potentially damage or melt parts of the fixture.

• Inspect Mounting Surface
  Periodically check that the surface can support the luminaire's weight. Ensure the lamp stands securely to prevent tipping.

• Professional Installation
  Consult a qualified electrician to ensure correct branch circuit conductor and adherence to local codes and jurisdiction.