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Related Experiment Videos

Irradiance and spectral distribution control system for controlled environment chambers.

M J Krones1, J C Sager, A T Johnson

  • 1Smithsonian Environmental Research Center, Rockville, MD 20852, USA.

Hortscience : a Publication of the American Society for Horticultural Science
|June 1, 1987
PubMed
Summary

This study presents a closed-loop system for precise control of light intensity and spectrum in growth chambers. This system enables independent manipulation of irradiance and red to far-red light ratios for plant research.

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Area of Science:

  • Plant science
  • Photobiology
  • Controlled environment agriculture

Background:

  • Accurate control of light is crucial for understanding plant responses.
  • Previous methods lacked independent control over irradiance and spectral quality.

Purpose of the Study:

  • To develop and describe a closed-loop control system for fluorescent lamps.
  • To enable independent control of irradiance and spectral quality (red:far-red ratio).
  • To facilitate research on photomorphogenesis and photoperiodism.

Main Methods:

  • Implementation of a closed-loop control system for fluorescent lamps.
  • Independent manipulation of 400-800 nm irradiance.
  • Independent control of the red (600-700 nm) to far-red (700-800 nm) waveband ratio.
Keywords:
NASA Center KSCNASA Discipline Life Support SystemsNASA Discipline Number 61-20NASA Program CELSS

Related Experiment Videos

  • Variation of light parameters as functions of time.

    • Main Results:

    • Demonstrated independent control of irradiance and spectral quality.
    • System allows dynamic changes in light conditions over time.
    • Enabled precise manipulation of light parameters for experimental needs.

    Conclusions:

    • The developed system offers precise and independent control over light parameters.
    • This system is valuable for investigating plant photobiology and optimizing controlled environment agriculture.
    • Facilitates research into synergistic effects of light on plant development.