Re: 265 gal plant tank build has begun.
I do not claim a scientific approach and, I am sure, others will pitch in (or out) with better ideas. There are enough people who grow beautiful color plants with a fraction of my PAR.
I grow a number of plants that I use as rough indicators.
Ludwigia sp. red has a reputation of growing red under even low-medium light.
Limnophilia aromatica is another plant whose coloration I find to be pretty linear to the amount of light it gets.
Rotala macrandra will either die or grow mostly green undrer medium light. It's leaf shape is another light indicator.
Ludwigia repens is an ideal plant as you can see the colors transition from bottom to top, especially in a deeper tank.
I am finding that the color of Rotala indica is apparently more spectrum then light intensity dependant.
Some plants exhibit a reverse behavior. For example, Ambulia is darker green and bustier undrer moderate light. In high light it is lighter green with longer internodes. E. tenellus is another example.
Before somebody screams, I am the first to admit that keeping water and other environmental properties even nearly identical across multiple tanks is not practical for me personally. And to discount the effects of different environments beside the PAR might be too simplistic. In other words, YMMV.
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