Industrial LED luminaire with direct light distribution and three lighting characteristics. Slim profile of the housing for unobtrusive design. Luminaire housing made of 0,6mm sheet steel, white powder coated finish (RAL9003). LED modules mounted on 2mm massive aluminium tray for optimum thermal management and long life time. Flat bottom of the housing designed without cooling fins prevents dust collection and simplify the maintenance. Internal electronics with expanded temperature range. Up to 143 luminaire lumens per circuit watt. Smart version with integrated sensor suitable for use at mounting heights up to 16m. Each LED board has an individual lens arrangement ensuring the most efficient distribution of light from LED chips.