The point irradiance and the phytometric system

G. J C Da Costa, Joel L Cuello

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


Since the phytometric system, the new system of plant-based radiation measurement, allows for the expression of radiation measurement in terms of the standard radiation measures of flux, irradiance, exitance, intensity and radiance, one of its immediate advantages is that it makes possible the direct use of the equations of point radiation for plant-lighting applications. The objectives of this study were to use directly the equations of point radiation for plant-lighting applications using the phytometric system, and to express the spatial distribution of a luminaire's luminous intensity in candela into phytometric intensity in phytoW sr-1, enabling luminaire manufacturers to help architects, lighting engineers, lighting designers and plant growers in correctly evaluating the performance of their luminaires for plant-lighting applications, as opposed to visual applications for humans.

Original languageEnglish (US)
Title of host publicationActa Horticulturae
Number of pages6
Publication statusPublished - Jun 2006

Publication series

NameActa Horticulturae
ISSN (Print)05677572



  • Irradiance
  • Lighting
  • Luminaire
  • Phytometric
  • Plant lighting
  • Radiation

ASJC Scopus subject areas

  • Horticulture

Cite this

Da Costa, G. J. C., & Cuello, J. L. (2006). The point irradiance and the phytometric system. In Acta Horticulturae (Vol. 711, pp. 455-460). (Acta Horticulturae; Vol. 711).