(Science: biology) Events triggered by duration of illumination or pattern of light/dark cycles: often the wavelength of the illuminating light is important as for example in control of circadian rhythm in plants.

See: phytochromes. The response by organisms in response to the availability of light in their environment. Photoperiodism plays a part in some organisms [[biological clock but is primarily related to the way light affects plants flowering and the state of phytochrome.

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