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Troy, N.Y. -  12/10/2018

LRC Issues New DELTA Report on Sensor-Controlled Lighting

deltaThe Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has issued a new DELTA report: Sensor-Controlled Lighting in Multi-Family Corridors. This guide shows results from a field demonstration of sensor-controlled, bi-level corridor lighting in a multi-family apartment building. Occupants had positive feedback, and considerable energy savings were achieved.
“Saving lighting energy in multi-family corridors is becoming more feasible,” said DELTA Program Director Jennifer Brons, who authored the report. “LED luminaires can easily dim light output when corridors are vacant, rather than turning off entirely. Most importantly, the occupants had positive comments about safety and comfort with sensor-controlled, bi-level lighting.”
With support from the New York State Energy Research and Development Authority (NYSERDA), the LRC and Taitem Engineering collaborated with Albany Housing Authority (AHA) to upgrade 60 corridor lights on six floors of a below market rate apartment building in Albany, New York, known as Lincoln Square Two.  
The field demonstration was extremely successful. Approximately three-quarters of residents liked the new bi-level lighting. Residents approved of the short (5-minute) delay time and dimming to low (20%) light output when the corridor was vacant. Short delay times led to the best energy savings. Use of sensors to create bi-level lighting more than doubled energy savings compared to upgrading to fixed-output LEDs, even in busy elevator lobbies. The lower the dim setting when vacant, the greater the energy savings due to bi-level lighting.
Monitoring at other below market rate apartment buildings showed similar results: bi-level lighting can be expected to operate at low output 75-80% of the time, on average. At market rate apartment buildings, bi-level lighting can be expected to operate at low output approximately 90% of the time.
“As energy codes move toward increased adoption of advanced lighting control technologies, these results show how to use sensor-controlled lighting to improve energy efficiency without occupant dissatisfaction,” said Brons.
Since 1994, the DELTA program, which stands for Demonstration and Evaluation of Lighting Technologies and Applications, has produced more than 40 case studies at sites ranging from schools to office buildings to senior housing, along with numerous outdoor locations. The reports are written for lighting specifiers, building managers, architects, and others who design and install lighting, and are available for free download from the LRC website. 

About the Lighting Research Center
The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute is the world's leading center for lighting research and education. Established in 1988 by the New York State Energy Research and Development Authority (NYSERDA), the LRC conducts research in light and human health, transportation lighting and safety, solid-state lighting, energy efficiency, and plant health. LRC lighting scientists with multidisciplinary expertise in research, technology, design, and human factors, collaborate with a global network of leading manufacturers and government agencies, developing innovative lighting solutions for projects that range from the Boeing 787 Dreamliner to U.S. Navy submarines to hospital neonatal intensive-care units. In 1990, the LRC became the first university research center to offer graduate degrees in lighting and today, offers a M.S. in lighting and a Ph.D. to educate future leaders in lighting. Learn more at

About Rensselaer Polytechnic Institute
Founded in 1824, Rensselaer Polytechnic Institute is America's first technological research university. Rensselaer encompasses five schools, 32 research centers, more than 145 academic programs, and a dynamic community made up of more than 7,900 students and more than 100,000 living alumni. Rensselaer faculty and alumni include more than 145 National Academy members, six members of the National Inventors Hall of Fame, six National Medal of Technology winners, five National Medal of Science winners, and a Nobel Prize winner in Physics. With nearly 200 years of experience advancing scientific and technological knowledge, Rensselaer remains focused on addressing global challenges with a spirit of ingenuity and collaboration.