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Plants in general are odd things in that they adapt to their environment. One extreme example is the Eucalyptus tree which is an evergreen in Australia. Eucalyptus has been planted all over the world and when eventually it was planted in Russia, with its ice cold winters, the eucalyptus became deciduous.

Presumably, aquatic plants are also able to adapt to regular periods of light as well and continue to photosynthesize as long as all the chemicals needed for that reaction were present. The concept of a plant getting 'tired' and needing a 'sleep' after a hard day in the light is somewhat hard to prove. But I would not sneer at the concept. Something akin to it probably exists.

Providing enough light for plant growth, but not too much must be the aim. Hopefully viewing periods fit in with the biological schedule.

Rotala walichii and Rotala rotundifolia both exhibit nictinasty (close leaves during low or no light period) slightly after the lights come on (6:00am) and before the lights go off (5:45pm).

Experiment only would determine the optimum period for plant growth (or to facilitate less pruning or aims such as less algae) in a certain environment, with selected plants etc. What might be suitable for a Rotala sp. forest, might not work so well with a Ludwigia sp. flower bed.

Most aquatic gardener's lighting is expressly for viewing because they cannot afford dual lighting systems with high and low light on separate timers (not to mention that is a new idea here in America for many of uss).

A good topic. I can follow your line of thinking lately.

Andrew Cribb
 
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