Ok, so we all know that PAR is how to discuss a plant's lighting needs, however, we all still use the terms "low, moderate, and high" as describing a plants lighting needs. So... is anyone aware of a resouce that breaks down where low, moderate, and high fall into regarding a spectrum of PAR? For example... My Finnex Ray 2 DS has the following PAR data... 6 inches from surface = PAR 166 12 inches from surface = PAR 80 18 inches from surface = PAR 60 24 inches from surface = PAR 44 My tank is 20 inches deep with 3 inches of dirted substrate, meaning my ground cover dwarf sag will receive just above 60 PAR (20-3=17) while my Wisteria and Ludwigia Repens are maybe only 10 inches from the surface, so their PAR received is over 80. Question: What PARs are considered low, moderate, and high? I know folks grow dwarf hairgrass at around 30 PAR, which is a "moderate" light plant... so does that mean I'm running a high light tank? Or does high light mean an even greater PAR!?