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[APD] Optimum Photosynthetically Active Radiation Values for Aquatic Plants ? and relation to uW/nm/lm ?

  Does anybody know what is the Adequate or optimum Photosynthetically
  Active Radiation (PAR)  values that should be made available to fresh water aquatic plants for photosynthesis and is this depended on the plant concentration per unit area or plant canopy ?
  Also is there any method to derive the PAR values from micro watts/nm/lm ? or for that matter initial lm ? or what is the best method to calculate PAR if you have the following from the manufacturers data :-
  Luminous output in lumen, Luminous Efficacy in lm/W, Rated wattage in Watts
  Thank for all your help.

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