The SL Retrofit Series from TERRALUX is designed for use in stairwells and similar areas, where the space is typically unoccupied for long periods of time. With an optional built-in occupancy sensor, it provides up to 80 percent energy savings versus non-LED light sources. The series, which is available in 1-, 2- and 4-foot models, offers quick, easy installation on walls or ceilings. An optional built-in battery backup meets UL 924. The series provides a 10-year warranty.