{"product_id":"ph-4-3-cuivre-exterieure","title":"PH 4½-3","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe PH 4½-3 wall lamp belongs to the PH 3-shade family, the principle of which was developed by Poul Henningsen during the winter of 1925-26 for the Forum exhibition hall in Copenhagen.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe system is based on the combination of diffuse reflection and a logarithmic shade curve. This geometry allows each shade to evenly decrease the amount of light emitted according to its distance from the bulb; the brightness transitions from one shade to the next thus appear harmonic. The relative size of the shades and their positioning are determined by the need to reduce glare, the arrangement of light on the shades, and the requirements for light distribution.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe PH 4½-3 nomenclature follows the convention established by Henningsen: the first number indicates the approximate diameter of the upper shade (i.e., 45 cm) and the second number indicates that the middle and lower shades were sized for the 3 size format. The combination thus associates a large upper shade with more compact middle and lower shades, a configuration initially developed for low-hanging pendants that naturally lends itself to use as a wall lamp.\u003c\/p\u003e\n\u003ch3\u003eColor\u003c\/h3\u003e\n\u003cp\u003eShades, arm, and wall box: brushed copper, untreated surface, evolving natural patina (the shade changes over time depending on exposure)\u003cbr\u003eInside of shades: matte white (reflector)\u003c\/p\u003e\n\u003ch3\u003eMaterials\u003c\/h3\u003e\n\u003cp\u003eShades and wall box: drawn copper, brushed finish\u003cbr\u003eArm: copper, brushed finish\u003c\/p\u003e\n\u003ch3\u003eLight source and electrical data\u003c\/h3\u003e\n\u003cp\u003eSource: 1 × E27, max. 100 W (not included)\u003cbr\u003eVoltage: 220–240 V\u003cbr\u003eReference luminous flux: 735 lm (measured with a 100 W incandescent source, varies according to the installed source)\u003cbr\u003eProtection rating: IP23 (to be installed under shelter or in an area protected from direct oblique rain)\u003cbr\u003eElectrical class: I\u003cbr\u003eBUG Rating: B0 U1 G0 (full cut-off luminaire, without light pollution)\u003cbr\u003eConnection: terminal block 1 × 3 × 2.5 mm²; cable entries 2 at the bottom and 2 at the back for Ø 10–14.5 mm cables; series wiring approved, 3 × 1.5 mm² max.\u003c\/p\u003e\n\u003cp\u003eManufacturer and ref.\u003cbr\u003eLouis Poulsen, 5743142880 — brushed copper finish, designed by Poul Henningsen\u003c\/p\u003e","brand":"Louis Poulsen","offers":[{"title":"Default Title","offer_id":56896879558988,"sku":"5743142880","price":2540.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0796\/0546\/5420\/files\/PH4_-3_2.webp?v=1772633401","url":"https:\/\/eclairagefrancais.fr\/en\/products\/ph-4-3-cuivre-exterieure","provider":"ÉCLAIRAGE FRANÇAIS","version":"1.0","type":"link"}