PH 4.5/3.5 Floor Lamp is a member of the of the PH 3-shade family principles, which were developed in the winter of 1925-26 for a large exhibition hall in Copenhagen, Denmark called "Forum". The PH 4.5/3.5 Floor Lamp provides a primarily upward illumination. It is based on the principle of a reflecting multi-shade system, creating a harmonious and glare free illumination. All handblown opal glass shades are sandblasted on the undersides for uniform light distribution.