Poul Henningsen

Danish architect, author, and cultural critic Poul Henningsen (1894–1967)—often simply known as PH—was the world’s pioneer of modern lighting theory. Henningsen devoted his life to understanding how artificial light affects human well-being, applying logarithmic spiral mathematics and physics to banish harsh glare and soften the transition from incandescent bulbs to living spaces. Henningsen achieved historic prominence through his lifelong partnership with Danish lighting house Louis Poulsen, begun in 1924. His defining breakthrough was the multi-shade PH Lamp system (1926), engineered to direct light downward while diffusing a soft, ambient glow. His timeless masterpieces include the celebrated PH 5 Pendant (1958)—designed to provide 100% glare-free light regardless of light source—and the sculptural PH Artichoke (1958), originally designed for Copenhagen’s Langelinie Pavillonen using 72 staggered copper leaves.