Reducing Lighting Energy Use in Controlled Agricultural Environments

Mark S. Rea, Jennifer Brons, Charles Jarboe

Research output: Contribution to journalArticlepeer-review


Photometric simulations using both daylight and electric lighting were performed to compare the energy use of conventional high-pressure sodium (HPS) greenhouse lighting to that of light-emitting diode (LED) lighting. Photometric simulations of a hypothetical greenhouse were performed in three different geographic locations in the United States with widely different annual daylight availability: Albany, NY, Fairbanks, AK, and Phoenix, AZ. Simulation conditions included summer and winter, overcast and clear skies, and several lighting layouts and distributions. The analysis showed that, while maintaining the criteria levels of photosynthetic photon flux density, lighting energy savings were primarily attributable to increased LED source efficacy rather than HPS. Secondary energy savings were attributable to the ability to continuously dim LED lighting in response to daily and seasonal changes in daylight. Despite options for LED luminaires with a slim form factor, reduced crop shading compared with larger conventional HPS luminaires did not result in significant lighting energy savings.

Original languageEnglish
Pages (from-to)954-961
Number of pages8
JournalHortscience: A Publication of the American Society for Hortcultural Science
Issue number8
StatePublished - Aug 2023


  • crop shading
  • energy use
  • greenhouse lighting
  • light-emitting diodes


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