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Vanessa S. Gordon and Jack E. Staub

representation of three cucumber chilling experiments conducted under controlled conditions [5.5 h (0800 to 1330 hr ) at 4 °C (immediate and constant) where the light level was 270 μmol·m −2 ·s −1 photosynthetic photon flux ( PPF ) supplied by only cool white

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Claudia Elkins and Marc W. van Iersel

days ( Fig. 1 ). This resulted in precise control, and all supplemental lighting treatments received a DLI of 12.0 ± 0.0 mol·m −2 ·d −1 every day. Fig. 1. Photosynthetic photon flux density ( PPFD ) over the course of a 24-h period on an overcast day

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Woei-Jiun Guo, Yu-Zu Lin, and Nean Lee

uptake during the day (○), during the night (•), and over a daily 24-h period (△), in Phalaenopsis amabilis ‘TS97’ leaves. The photosynthetic photon flux ( PPF; μmol·m −2 ·s −1 ) measured on the leaves were shown in the left corner ( A ). Levels of ( C

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Jakob Markvart, Eva Rosenqvist, Helle Sørensen, Carl-Otto Ottosen, and Jesper M. Aaslyng

below a photosynthetic photon flux ( PPF ) of 200 μmol·m −2 ·s −1 , the leaf assimilation of chrysanthemum can be considered as responding close to linearly to irradiance levels. Supplemental light levels differ but are often lower than 200 μmol·m −2 ·s

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Qinglu Ying, Yun Kong, and Youbin Zheng

.5 µmol·m −2 ·s −1 far-red light; BRFR H = 15% blue and 85% red with additional 155 µmol·m −2 ·s −1 far-red light; BG L R = 9% blue, 6% green, and 85% red; BG H R = 5% blue, 10% green, and 85% red. The photosynthetic photon flux density of each lighting

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Marc W. van Iersel, Geoffrey Weaver, Michael T. Martin, Rhuanito S. Ferrarezi, Erico Mattos, and Mark Haidekker

(top) and a simplified diagram of the duty cycle control board (bottom). A fluorometer is used to measure the quantum yield of photosystem II and the datalogger calculates the electron transport rate from this and the photosynthetic photon flux density

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Chase Jones-Baumgardt, David Llewellyn, and Youbin Zheng

known as integrated photosynthetic photon flux (IPPF), Chun et al., 2001 ] is not yet a commonly-used metric in the scientific community, it can normalize quantifications of light “doses” from different production scenarios (e.g., SS vs. greenhouse) and

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Heidi M. Wollaeger and Erik S. Runkle

) . Fig. 1. The spectral distribution of seven light quality treatments delivered by blue (B; 400–500 nm) and red (R; 600–700 nm) LEDs or cool-white fluorescent lamps, each delivering a photosynthetic photon flux of 160 μmol·m −2 ·s −1 . The value after

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Wook Oh, Erik S. Runkle, and Ryan M. Warner

sunlight plus direct (SL; 90 μmol·m −2 ·s −1 ) or diffuse lighting [photoperiodic lighting (PL); 3 μmol·m −2 ·s −1 ] from high-pressure sodium (HPS) lamps. Lamps were operated when the ambient greenhouse photosynthetic photon flux ( PPF ) was less than 400

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Juanxu Liu, Min Deng, Richard J. Henny, Jianjun Chen, and Jiahua Xie

collected from D. surculosa ‘Florida Beauty’ stock plants in late spring. The stock plants had grown in a shaded greenhouse for 3 years under a maximum photosynthetic photon flux ( PPF ) density of 300 μmol·m −2 ·s −1 at the University of Florida's Mid