Primula post is designed by Knud Holscher and is a natural enlargement of the Primula series of bollards and wall luminaries introduced in 2006. Knud Holscher developed the optical principles behind the Primula series in collaboration with consultative engineer Jens Gudum of Hansen & Henneberg. The optical principles in Primula post take its points of origin in the Primula bollards. The basis component is a symmetrical reflector that transmits light from the source directly to the top reflector, which ensures an effective distribution. The other optical element is white reflecting rings which utilise the light that does not hit the reflector. The stray light is collected and used by the white rings without affecting the post’s efficiency. In addition, a third optical element is included in the post top. Two bottom reflectors send a minor luminous flux through the bottom of the armature housing and illuminate the pole and its base.