PH 4/3 PendantPH 4 3 pendant 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 3 pendant lamp provides a primarily downward illumination based on the principle of a reflecting multi shade system, creating a harmonious and glare free illumination.