Originally Posted by Big Fate
The Life-Glo is a T8 Full Spectrum daylight tube. Not sure what you mean by "average" tank?
1 WPG is pretty low Bryon, how do you consider that Moderate light? That's more in the low's if you asked me.
"Average" as in size, the wpg "guide" is less reliable with small tanks and very large tanks. I use fluorescent tubes on my 29g, 33g, 70g, 90g and 115g and all work out to under 1 wpg [except the 70g which is 80w over a 70g]. I use Life-Glo tubes and Phillips Daylight Deluxe, T8. As one example of unreliable "watts" consideration, the Life-Glo is 40w; I could use ZooMed Ultra Sun tubes which are only 32w but deliver the same intensity as the Life-Glo 40w. Watts is not reliable, only a guide, sometimes.
I said there is not agreement on these terms
. There are still many authors who write that you cannot have successful plant growth with less than 2-3 wpg. That is nonsense. I've been doing this for more than 20 years, and the photos of my tanks are proof that this does work. One simply has to balance it. I still get algae, and that means too much light, so I reduce the light period to restore the balance. And when you add to the equation that one tube of 32w and another make of 40w produce the same intensity of light, this wpg things flies out the window anyway.
I can grow low and moderate light plants well. Echinodorus species are all deemed moderate to bright by most authors, and I have no problem at all growing these; they send out runners and inflorescences regularly, I am throwing out plants all the time onto the compost. If moderate-light plants grow so well under my light, I must have moderate light
Over my 115g tank, if i were to attempt 2 watts per gallon, I would need more than 7 48-inch tubes using the ZooMed 32w tubes. That is simply ludicrous. I only have two tubes now, and it is bright (to me and the fish).