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PH 5-4½ + PH 6½-6 Pendant Lamp
Louis Poulsen
Overview

The PH three-shade system was originally designed in 1926 by Poul Henningsen; he was the first person to pursue a scientific approach to light and used the logarithmic spiral to achieve an even distribution of light over the entire curve of the shade. The PH four-shade system was launched in 1931 and was designed to increase the amount of light emitted horizontally to provide greater illumination of walls and shelves than was possible using standard three-shade lights. The PH 5-4½ & PH 6½-6 feature a small blue shade, which helps to prevent a glare from the light.

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