- Detectable emission of light as delayed
  fluorescence in the moment of transfer a
  healthy plant from the lightness into
  the darkness
- During its dark adaptation, partial reverse of
  the process  of photosynthesis happens
- Special suitability of algae because of the
  easy handling allows testing of toxic
  pollutants in sewage
- Dependence of the light intensity of the biological
  activity of the algae, Decreasing
  of the bioluminescence
  in case of harmed algae
- Typical delayed fluorescence intensity-curves
- Evaluation of the peak area or the peak height
- Well-arranged software allows specific and easy
  evaluation
- Possibility of long-term measurements with kinetic
  information