A phytometric irradiance measuring instrument

G. J.C. Da Costa, J. L. Cuello

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The normalized relative quantum efficiency (RQE) curve, which shows the relative photosynthetic response to radiation of the average photosynthesizing plant, was used as the basis in developing the phytometric system, the new system for plant-based radiation measurement. Based on the multiplication of the RQE curve with the spectral power distribution (SPD) of a given radiation source within the range of photosynthetically useful radiation (320 nm - 780 nm), the resulting phytometric measurement has a basic unit of phytoWatt or Wp. The accuracy, versatility and user-friendliness of the phytometric system endow it with significant potential to become the universal standard for plant-based radiation measurement. The prototype for the phytometric irradiance meter is a multifunctional radiation meter that growers, engineers, architects and scientists would find very useful.

Original languageEnglish (US)
Title of host publicationProceedings of the Fifth Int. Symposium on Artificial Lighting in Horticulture
PublisherInternational Society for Horticultural Science
Number of pages6
ISBN (Print)9066055391, 9789066055391
StatePublished - Jun 2006

Publication series

NameActa Horticulturae
ISSN (Print)0567-7572


  • Instrument
  • Lighting
  • Phytometric
  • Radiation
  • Sensor

ASJC Scopus subject areas

  • Horticulture


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