LED luminaire for installation flat on the ceiling or wall. High lumen output and good efficiency that meets with tough market demands and requires fewer luminaires per installation. IP44 and class II to suit many indoor environments. Easily installed long-life luminaire with microwave sensor for wireless communication (RF) between luminaires in staircases and corridors. Adjustable base light level, range, time delay and standby via dip switch. Possibility of surface mounted cable routing.