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Allison Hurt, Roberto G. Lopez, and Joshua K. Craver

. 1 ). Fig. 1. Spectral quality delivered from high-intensity 400-W high-pressure sodium lamps ( A ) or 200-W light-emitting diode lamps ( B ) at a photosynthetic photon flux density ( PPFD ) from 400–700 nm of 90 µmol·m –2 ·s –1 , 15-W red:white ( C

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Giedrė Samuolienė, Akvilė Urbonavičiūtė, Pavelas Duchovskis, Zenonas Bliznikas, Pranciškus Vitta, and Artūras Žukauskas

high-pressure sodium lamps (HPS) (Son-T Agro; Philips, UK) at a PPFD of ≈130 μmol·m −2 ·s −1 (18-h photoperiod; daily integral of lighting ≈8.5 mol·m −2 ). At the preharvest stage of 3 d, plants were transferred to a phytotron chamber and exposed to

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Ariana P. Torres and Roberto G. Lopez

. Sowing and harvest dates, mean photosynthetic photon flux ( PPF ) provided by high-pressure sodium lamps, shadecloth percentage, mean daily light integral (DLI), and leaf and air temperatures during 5 weeks of Tecoma stans seedling propagation. Effects

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Ki-Ho Son and Myung-Min Oh

) with normal growing conditions [20 °C, fluorescent lamp + high-pressure sodium lamp, photosynthetic photon flux ( PPF ) 177 ± 5 μmol·m −2 ·s −1 , 12-h photoperiod] for 18 d. Fifteen seedling plugs per treatment were transferred to a growth chamber (VS

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Ryan M. Warner

-interruption lighting from incandescent lamps from 2200 to 0200 hr ), or a 16-h photoperiod (16-h HPS; ambient light plus 90 μmol·m −2 ·s −1 from high-pressure sodium lamps from 0600 to 2200 hr ) at 20 ± 1 °C (24-h mean ± sd ) until flowering. Photosynthetic photon

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Ricardo Hernández and Chieri Kubota

, pelargonium, and petunia propagated under light-emitting diodes and high-pressure sodium lamps have comparable growth, morphology, gas exchange, and post-transplant performance HortScience 48 428 434 Decoteau, D.R. Kasperbauer, M.J. Daniels, D.D. Hunt, P

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

(3 μmol·m −2 ·s −1 ) lighting from high-pressure sodium lamps to achieve the high or low DLI treatments, respectively. Seedlings were grown for 27 or 33 d and received supplemental lighting for one-third, two-thirds, the entire duration, or no part of

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Paul Deram, Mark G. Lefsrud, and Valérie Orsat

towers and overhead high pressure sodium lamps for supplemental lighting of greenhouse grown tomatoes HortTechnology 23 93 98 Goto, E. 2003 Effects of light quality on growth of crop plants under artificial lighting Environ. Control in Biol. 41 121 132

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Celina Gómez and Cary A. Mitchell

Year-round production of greenhouse-grown tomatoes in temperate climates typically requires SL for optimal fruit yield and quality. High-pressure sodium lamps have been the lamp of choice for greenhouse SL because their high-intensity output

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

continuously in all chambers using Vaisala CARBOCAP® Carbon Dioxide Probes (GMP343; Vaisala, Helsinki, Finland). Two high-pressure sodium lamps (SON-T, Green Power; Philips, Bruxelles, Belgium) were placed 1 m above each chamber supplementing natural light with