Wisteria needed around 2wpg to grow in my 10g fuge, and now it grows fast. Under <2wpg and CO2
the lower leaves died off, and the plant grew slowly. For me java moss looked best under lower light
than med light; now it doesn't get any denser, just grows and dies at the same rate. I don't understand this.
How about a daylight bulb and replacing wisteria with java fern, anubias sp, or crypts?
So why not just measure it in watts per square inches of surface area?
Watts are a measure of consumption; lumens are a measure of light. Incandescent lights are considered less efficient than flourescents because they have less lumens per watt, for example.
It is important to realize these and other formulas and metrics attempt to quantify experience. People with small tanks following general wpg
rules found problems with growing high light plants. Check out the lighting over the small AGA competition tanks
, I'm finding this true of med/high light plants, but not low light plants.