To Laila and John,
Still in production :
"Poul Henningsen designed the PH5 lamp for Louis Poulsen in 1958. It is still in production. The PH5 lamp is considered to be a classical masterpiece and the ultimate functional style icon. Poul Henningsen named it the PH5 because the diameter of the top shade is 50 cm. The number "5" refers to 5 dm (19.7").
The PH5 lamp provides a glare free illumination. The design of the visible reflectors ensures that light is directed both vertically and horizontally. Light is diffused through a sandblasted glass shield located in the lower shade. The inside cone is painted red, and together with the small blue reflector creates a warmer tone of light. The Louis Poulsen PH5 pendant lamp was designed to hang low above a table while at the same time giving a moderate light to the surroundings. The design of the visible reflectors ensures that light is directed both vertically and horizontally. Regardless of how the lamp is installed and no matter which incandescent bulb it is furnished with, the PH5 is completely glare-free.
The PH5 lamp is a classic icon of mid century modern Scandinavian design."
For further informations : http://www.louispoulsen.com/fr/About/History.aspx