Document Type : Research Article


Department of Energy Engineering, Sharif University of Technology, P. O. Box: 11365-9567, Tehran, Tehran, Iran.


Light is a critical parameter for plant growth such that providing enough light for the plant can ensure better quality and higher yield in greenhouses. In many areas, in the cold seasons of the year, not enough natural light reaches the plant. Thus, to compensate for the natural light deficit, artificial light is used. Since the use of artificial light leads to energy consumption, effective parameters in the energy consumption of the lighting system such as available natural light, greenhouse shape, and the on-off plan of the lighting system should be considered. In this paper, available natural light is estimated based on greenhouse structure in five cities of Iran. Then, the natural light deficit was investigated. Finally, to achieve clean cultivation, the utilization of photovoltaic panels is investigated to compensate for the electrical energy needed for supplementary lighting. The results show that although Iran is recognized as a region with high solar energy potential, natural light is not enough for optimum tomato lighting demand. Using supplementary lighting in greenhouses could compensate for the lack of natural light in proportion to the capacity of the lighting system. In 73.22 % to 91.32 % of days in the period of September to April, the natural light is not sufficient for optimum lighting. Therefore, 98  to 377  electricity is needed to supply power for supplementary lighting system. Accordingly, the photovoltaic area and its associated with costs to compensate electrical energy consumption for the supplementary lighting is estimated to be 0.47  to 2.58  per m2 of greenhouse area, which is equal to $ 171.08 to $ 939.12 per m2 of greenhouse area, respectively.


Main Subjects

  1. Agrios, G.N., "Chapter three-Effects of pathogens on plant physiological functions", Plant pathology, Fifth Edition, Agrios, G.N. Ed., Academic Press, San Diego, (2005), 105-123 (
  2. Serale, G., Gnoli, L., Giraudo, E. and Fabrizio, E., "A supervisory control strategy for improving energy efficiency of artificial lighting systems in greenhouses", Energies, Vol. 14, No. 1, (2021), 202. (
  3. Wien, H.C. and Stützel, H., "Chapter seven, Tomato", The physiology of vegetable crops, CABI, (2020), 163-164. (
  4. Tewolde, F.T., Lu, N., Shiina, K., Maruo, T., Takagaki, M., Kozai, T. and Yamori, W., "Nighttime supplemental LED inter-lighting improves growth and yield of single-truss tomatoes by enhancing photosynthesis in both winter and summer", Frontiers in Plant Science, Vol. 7, (2016), 448. (
  5. De Pascale, S., Maggio, A., Orsini, F., Stanghellini, C. and Heuvelink, E., "Growth response and radiation use efficiency in tomato exposed to short-term and long-term salinized soils", Scientia Horticulturae, Vol. 189, (2015), 139-149. (
  6. Xu, D., Du, S. and van Willigenburg, G., "Double closed-loop optimal control of greenhouse cultivation", Control Engineering Practice, Vol. 85, (2019), 90-99. (
  7. Ahamed, M.S., Guo, H. and Tanino, K., "Energy saving techniques for reducing the heating cost of conventional greenhouses", Biosystems Engineering, Vol. 178, (2019), 9-33. (
  8. Sethi, V.P., "On the selection of shape and orientation of a greenhouse: Thermal modeling and experimental validation", Solar Energy, Vol. 83, No. 1, (2009), 21-38. (
  9. Von Elsner, B., Briassoulis, D., Waaijenberg, D., Mistriotis, A., Von Zabeltitz, C., Gratraud, J., Russo, G. and Suay-Cortes, R., "Review of structural and functional characteristics of greenhouses in European Union countries, Part II: Typical designs", Journal of Agricultural Engineering Research, Vol. 75, No. 2, (2000), 111-126. (
  10. Gupta, M.J. and Chandra, P., "Effect of greenhouse design parameters on conservation of energy for greenhouse environmental control", Energy, Vol. 27, No. 8, (2002), 777-794. (
  11. Mobtaker, H.G., Ajabshirchi, Y., Ranjbar, S.F. and Matloobi, M., "Solar energy conservation in greenhouse: Thermal analysis and experimental validation", Renewable Energy, Vol. 96, (2016), 509-519. (
  12. Dorais, M., "The use of supplemental lighting for vegetable crop production: Light intensity, crop response, nutrition, crop management, cultural practices", Proceedings of Canadian Greenhouse Conference, Vol. 9, (2003). (
  13. Garcia-Caparros, P., Chica, R.M., Almansa, E.M., Rull, A., Rivas, L.A., García-Buendía, A., Barbero, F.J. and Lao, M.T., "Comparisons of different lighting systems for horticultural seedling production aimed at energy saving", Sustainability, Vol. 10, No. 9, (2018), 3351. (
  14. Lu, N., Maruo, T., Johkan, M., Hohjo, M., Tsukagoshi, S., Ito, Y., Ichimura, T. and Shinohara, Y., "Effects of supplemental lighting with light-emitting diodes (LEDs) on tomato yield and quality of single-truss tomato plants grown at high planting density", Environmental Control in Biology, Vol. 50, No. 1, (2012), 63-74. (
  15. Paucek, I., Pennisi, G., Pistillo, A., Appolloni, E., Crepaldi, A., Calegari, B., Spinelli, F., Cellini, A., Gabarrell, X. and Orsini, F., "Supplementary LED interlighting improves yield and precocity of greenhouse tomatoes in the Mediterranean", Agronomy, Vol. 10, No. 7, (2020), 1002. (
  16. Gómez, C. and Mitchell, C., "Supplemental lighting for greenhouse-grown tomatoes: Intracanopy LED towers vs. overhead HPS lamps", Proceedings of ISHS Acta Horticulturae 1037: International Symposium on New Technologies for Environment Control, Energy-Saving and Crop Production in Greenhouse and Plant Factory-Greensys 2013, (2013), 855-862. (
  17. Körner, O., Andreassen, A.U. and Aaslyng, J.M., "Simulating dynamic control of supplementary lighting", Proceedings of ISHS Acta Horticulturae 711: V International Symposium on Artificial Lighting in Horticulture, (2005), 151-156. (
  18. Heuvelink, E. and Challa, H., "Dynamic optimization of artificial lighting in greenhouses", Proceedings of ISHS Acta Horticulturae 260: International Symposium on Growth and Yield Control in Vegetable Production, (1989), 401-412. (
  19. Niu, G., Heins, R.D., Cameron, A.C. and Carlson, W.H., "Day and night temperatures, daily light integral, and CO2 enrichment affect growth and flower development of Campanula carpatica ‘Blue Clips’", Scientia Horticulturae, Vol. 87, No. 1-2, (2001), 93-105. (
  20. Kottek, M., Grieser, J., Beck, C., Rudolf, B. and Rubel, F., "World map of the Köppen-Geiger climate classification updated", Meteorologische Zeitschrift, (2006). (
  21. Rahimi, J., Laux, P. and Khalili, A., "Assessment of climate change over Iran: CMIP5 results and their presentation in terms of Köppen–Geiger climate zones", Theoretical and Applied Climatology, Vol. 141, No. 1, (2020), 183-199. (
  22. Pfenninger, S. and Staffell, I., "Long-term patterns of European PV output using 30 years of validated hourly reanalysis and satellite data", Energy, Vol. 114, (2016), 1251-1265. (
  23. Staffell, I. and Pfenninger, S., "Using bias-corrected reanalysis to simulate current and future wind power output", Energy, Vol. 114, (2016), 1224-1239. (
  24. Kalogirou, S.A., "Chapter two, Environmental characteristics", Solar energy engineering: processes and systems, Academic Press, (2013), 80-82. (
  25. Carruthers, T.J., Longstaff, B.J., Dennison, W.C., Abal, E.G. and Aioi, K., "Measurement of light penetration in relation to seagrass", Global Seagrass Research Methods, (2001), 370-392. (
  26. Tsubo, M. and Walker, S., "Relationships between photosynthetically active radiation and clearness index at Bloemfontein, South Africa", Theoretical and Applied Climatology, Vol. 80, No. 1, (2005), 17-25. (
  27. Rao, C.N., "Photosynthetically active components of global solar radiation: Measurements and model computations", Archives for Meteorology, Geophysics, and Bioclimatology, Series B, Vol. 34, No. 4, (1984), 353-364. (
  28. Udo, S. and Aro, T., "Global PAR related to global solar radiation for central Nigeria", Agricultural and Forest Meteorology, Vol. 97, No. 1, (1999), 21-31. (
  29. Dorais, M. and Gosselin, A., "Physiological response of greenhouse vegetable crops to supplemental lighting", Proceedings of ISHS Acta Horticulturae 580: IV International ISHS Symposium on Artificial Lighting, (2000), 59-67. (
  30. Runkle, E., "An update on LED lighting efficacy", Department of Horticulture, Michigan State University, (2018). (
  31. Heuvelink, E., Bakker, M., Hogendonk, L., Janse, J., Kaarsemaker, R. and Maaswinkel, R., "Horticultural lighting in the Netherlands: New developments", Proceedings of ISHS Acta Horticulturae 711: V International Symposium on Artificial Lighting in Horticulture, (2005), 25-34. (
  32. Masters, G.M., "Chapter nine, Photovoltaic systems", Renewable and efficient electric power systems, John Wiley & Sons, (2013), 528-533. (
  33. Jacobson, M.Z. and Jadhav, V., "World estimates of PV optimal tilt angles and ratios of sunlight incident upon tilted and tracked PV panels relative to horizontal panels", Solar Energy, Vol. 169, (2018), 55-66. (
  34. LG NeON® R 380 W. (
  35. "Top 10 solar panels-Latest solar panel and PV cell technology," (2021). (, (Accessed:May 2, 2021).
  36. Martineau, V., Lefsrud, M., Naznin, M.T. and Kopsell, D.A., "Comparison of light-emitting diode and high-pressure sodium light treatments for hydroponics growth of Boston lettuce", HortScience, Vol. 47, No. 4, (2012), 477-482. (
  37. "LG NeON® R price". (