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Analysis of Arabidopsis thaliana Growth Behavior in Different Light Qualities
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Quantifying biologically essential aspects of environmental light.

Dan-E Nilsson1, Jochen Smolka1

  • 1Lund Vision Group, Department of Biology, Lund University, Sölvegatan 35, 22362 Lund, Sweden.

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|April 28, 2021
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Summary

A new Environmental Light Field (ELF) method quantifies light environments comprehensively, capturing previously overlooked visual data. This tool aids in assessing and comparing diverse lighting conditions for better design and ergonomics.

Keywords:
cameraenvironmental lightenvironmental light fieldhuman visionmeasurement methodradiometry

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Area of Science:

  • Optometry and Vision Science
  • Architectural Lighting Design
  • Environmental Physics

Background:

  • Current methods for quantifying light environments are limited, failing to capture crucial parameters reaching the human eye.
  • Assessing light environments is vital for interior lighting, architectural design, and visual ergonomics.
  • Existing techniques often overlook key aspects of light that directly impact visual perception.

Purpose of the Study:

  • To introduce a novel method, the Environmental Light Field (ELF) method, for comprehensive quantification of light environments.
  • To address the limitations of current methods by including light reaching the eye.
  • To provide a complete description of factors characterizing a light environment.

Main Methods:

  • Utilizing a calibrated digital image sensor with wide-angle optics to record environmental radiances.
  • Measuring absolute photon flux, spectral composition (RGB), and variation (contrast-span) as a function of elevation angle.
  • Developing the Environmental Light Field (ELF) method for detailed light environment characterization.

Main Results:

  • The ELF method quantifies all essential features of a light environment, including previously overlooked aspects.
  • It provides a complete description of light characteristics, enabling accurate assessment and comparison.
  • Characteristic light distributions were identified in various natural and artificial environments.

Conclusions:

  • The Environmental Light Field (ELF) method is a powerful and convenient tool for assessing and comparing light environments.
  • It offers a standardized approach to understanding light's impact on visual perception.
  • The method facilitates informed decisions in lighting design, architecture, and visual ergonomics.