The Artemis Series of LED lighting fixtures is designed for use in areas that are seldon occupied or only for short periods of time such as stairwells. This makes possible the reduction of energy usage by up to 85% by automatically providing full on light levels only when the space is occupied. The Artemis XS Stairwell Fixture is configured to meet specific requirements related to stairwell applications. It operates at 42 watts input power and 4,500 lumens illumination when the stair- well is occupied and dims to a power level of 12 watts and 1,200 lumens when the space is unoccupied. Tracking, which consists of the intelligent wireless RF system that links multiple fixtures, together with occupancy sensing is also included. Color temperature of the Artemis XL is 4,000°K while 5,000°K is available upon request. A battery backup system is offered as an option. Artemis XB, is the basic unit and operates at 42 watts input and 4,500 lumens output.