Abstract: A modular construction system for quick and convenient construction of buildings, comprising construction panels generally in the order of 600 m wide. The modular construction system includes construction panels, framed construction panels, lintel panels, and framed lintel panels, that together allow a wide variety of building configurations to be assembled. The construction panel includes a cast cement wall member and partially embedded channel shaped sheet steel support members, with the wall member defining an extended portion that extends from the support member to the edge of a major face of the wall member. The framed construction panels is 600 mm wide and includes shaped sheet steel support members extending from a major face at least partially around its periphery.

Abstract: A presence detection system for detecting presence of a living being (2) within an area (4), the system comprising a first light source (6a) providing light of a first spectrum, a first sensing means (8a; 10a) which is arranged to filter the light of the first spectrum. The first sensing means produces a first presence detection signal (12a) based on the light of the first spectrum originated from the first light source and reflected from the living being (2). The presence detection system comprises a processor device (14) for concluding the living being's presence within the area (4) based on the first presence detection signal (12a). The processor device provides a position (22a) of the living being (2) within the area based on the intensity of the first presence detection signal (12a) and based on the known position of the first light source (6a) within the area (4). The invention further relates to a lighting system comprising the above described presence detection system.