The PH-lamp is a term for light fixtures designed by Danish designer and writer Poul Henningsen. The term is sometimes used to refer to any lamp designed by Henningsen or specially Henningsen's three-shade lamp series. The lamps are produced by Louis Poulsen.
Henningsen's lamps are designed with multiple concentric shades to eliminate visual glare, only emitting reflected light, obscuring the light source. Henningsen's sleek, spare lamp was awarded a gold medal at the 1925 International Exhibition of Modern Decorative and Industrial Arts.
- "The PH lamp", Design, Visit Denmark, archived from the original on 2012-02-15.
- Mussari, Mark (2016-06-16). Danish Modern: Between Art and Design. Bloomsbury Publishing. ISBN 978-1-4742-2369-0.
- Kamp, Claudy Op den; Hunter, Dan (2019-06-20). A History of Intellectual Property in 50 Objects. Cambridge University Press. ISBN 978-1-108-42001-3.
- "Poul Henningsen", Designers, Louis Poulsen Lighting, archived from the original on 2013-11-18.
- The Lights of Poul Henningsen, Phillips, 12 September 2016, retrieved 3 February 2018
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