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This article in AJ

  1. Vol. 66 No. 5, p. 703-706
     
    Received: Oct 6, 1973


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doi:10.2134/agronj1974.00021962006600050029x

Application of Long-Arc Xenon Lighting for Plant Growth Experiments1

  1. G. D. Jarman,
  2. E. W. R. Barlow and
  3. L. Boersma2

Abstract

Abstract

The installation and use of a 2,500-W xenon long-arc lamp is described. Xenon arc lamps emit a high intensity radiant flux with a visible spectrum similar to that of unfiltered sunlight. These qualities make it desirable for use in laboratory studies of plant growth. Little published information describing the use of xenon lamps in such application is available. Many technical problems may be encountered in the installation of long-arc xenon lamps because of the lack of adequate installation instructions. The information presented here was developed over a long period of time and particular emphasis is on safety and cooling requirements.

Although this lamp is expensive to install and operate, the spectral distribution of its radiation within the visible (400 to 700 nm) and near infrared wavebands is closer to that of natural sunlight than any other lamp presently available. Within the photosynthetically active waveband the conversion factor from radiant to quantum flux was determined to be 4.56 μ Einstein s−1 m−2 per Wm−2 [Wm−2 = Watts per m,2. Diagrams were prepared showing the angular distribution of radiation from this lamp.

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