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About Us

What is Photobiology?

Photobiology is the biological study of the interactions of light with living organisms. The ASP promotes research in photobiology, integration of different photobiology disciplines, dissemination of photobiology knowledge, and provides information on photobiological aspects of national and international issues.

Photobiologists may specialize in the study of photosynthesis, vision, circadian rhythms, bioluminescence, ultraviolet radiation effects, photodynamic therapy, and other fields. The five divisions of the American Society for Photobiology (ASP) reflect the diversity and inter-disciplinary nature of photobiology.
  • Div. 1: Photochemistry, Photophysics and Phototechnology
  • Div. 2: Photosensory and Circadian Biology
  • Div. 3: Photosynthesis, Bio- and Chemiluminescence
  • Div. 4: Photomedicine
  • Div. 5: Environmental Photobiology and UV Effects


Photobiological Sciences Online is a free online textbook provided by the ASP that has numerous chapters on all of these subjects.

Photochemistry Photobiology is a professional journal owned by the ASP that regularly publishes research articles on all of these subjects.