Abstract
Gilberto J. C. da Costa and Joel L. Cuello The normalized quantum efficiency (RQE) curve that shows the relative photosynthetic response to light of the average photosynthesizing plant was used as the basis in developing the phytometric system, a new concept of light measurement for plants. Based on the multiplication of the RQE curve with the spectral power distribution (SPD) of a given light source, the phytometric measurement would yield units of phytoW.m - 2 . The unit phytoW easily provided conversion factors to the radiometric, photometric, and photon flux (quantum) systems within the photosynthetically active radiation (PAR) of 400 to 700 nm or within the extended PAR of 300 to 800 nm. The use of the phytometric system was demonstrated by applying it to four types of high-intensity discharge (HID) lamp. Pertinent conversion factors were calculated for each lamp type.
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