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Troy, N.Y. -  6/6/2016

LRC Issues New DELTA Report: Mogul Screw-base LED Replacement Lamps for High Bay Environments

Field Test DELTAThe Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has issued a new DELTA report on mogul-base light-emitting diode (LED) replacement lamps. These high-wattage lamps are designed to fit into the large mogul sockets found in commercial, industrial and outdoor lighting applications to replace conventional, high-intensity discharge (HID) lamps. LED replacement lamps have the potential to save substantial energy, reduce maintenance and improve color characteristics.

In 2015, LRC’s DELTA Program Director Jennifer Brons conducted an evaluation of mogul-base LED replacement lamps at the Bonneville Power Administration (BPA) Maintenance Facility, a warehouse and shop for electrical utility workers, serving southern Oregon. The space is used for storing vehicles, electrical equipment and supplies. The facility is also occasionally used on nights and weekends for repair or assembly tasks and for weather-related electrical emergencies. The original lighting (metal halide lamps) was installed when the facility was built in the early 1990s. The LRC conducted an evaluation of the lighting before and after retrofit with mogul-base LED replacement lamps.

The field test objectives were to:

  • Assess ease of retrofit
  • Compare worker acceptance before and after retrofit
  • Compare energy performance before and after retrofit

Key findings of the DELTA report include:

  • Power demand of the LED retrofit was 60% lower than the conventional metal halide luminaires, without reducing light levels or creating hotspots underneath.
  • The retrofit increased light levels noticeably, compared to the existing degraded metal halide lamps with dirty lenses. Because lights were also turned off more frequently after the retrofit, higher energy savings (73%) were estimated.
  • Payback periods were long, but might be shorter at other sites with longer hours of use, higher electricity rates, or lower-cost LEDs.
  • Instant restrike characteristics of LEDs provide opportunities for other energy-saving technologies, such as vacancy/ occupancy sensors or time clocks.
  • The electrician had positive feedback about the installation experience.
  • Worker feedback about the retrofit was enthusiastically positive.
  • Workers preferred re-use of existing prismatic diffuser lenses, rather than leaving retrofitted luminaires open.

“The LED replacement lamps demonstrated at this BPA facility direct the light downward, delivering the light to a horizontal workplane more effectively than the previous metal halide lamps,” said Brons. “LED lamps such as these have the potential to illuminate high bay environments at equal or higher light levels, with lower power demand.”   

“The old lighting was inefficient and often required maintenance,” said Jennifer Williams, project manager, with BPA’s Facilities Planning and Projects. “The new LEDs improve employee safety and working conditions, and are much more energy efficient.”

“The project turned out great and is much appreciated,” said Craig Sanders, BPA facilities maintenance worker and project supervisor. “The installation was very straightforward. We were able to do 21 individual replacements in about a day’s time.”

The project was made possible through a partnership with BPA’s Emerging Technologies team.

The full-color, illustrated report, “Mogul Screw-base LED Replacement Lamps for High Bay Environments,” detailing the project evaluation and findings, is available for free download from the LRC website.

Other recent DELTA reports include LED Lighting in a Campus Building, LEDs for Construction Lighting and Daylighting in Whole Foods Market.

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.