2 watts per gallon of T5 is going to be very high light on most tank setups.
Most swords, however, are pretty low-light tolerant and don't need that much light. Some of the red ones will color up a bit better in higher light, and there are a few species that do need more light levels than others (Tropica swords and Red Devils come to mind), but most Echinodorus sp. can live in even 1 wpg of T8 light...
So my point is you can use that much light if you want to but it's not necessary.
I'm sorry for your loss.
Many thanks Laura.
Light fixture is nova extreme with two 54 watt T5 freshwater bulbs and I am planning on placing them over 80 gal tank, or possibly 75 gal.
I previously had the fixture on 55 gal and believe it was indeed a bit too much.(grew all kinds of algae)
Am not locked in to using the fixture and or bulbs if I can Get possible recommendation for alternative with close to what will be needed to fit the plants needs.
I realize particular plants have different growth rates under different lighting but am trying to provide decent growth for most low to moderate light plants and am not looking for rapid growth measured in days, but weeks would be welcomed.
Believe the mineralised substrate along with slow relase ferts,capped with pea gravel and weekly or bi-weekly water column dosing will give this tank it's best chance with my low level of expierience or so it is my hope.
I am reading ,reading,and assimilating.
Once again Thank you and I welcome any and all opinions.