I have 30 to 50 par at the substrate level, and 70 to 80s at the surface. All my supposedly red stems are mostly green except for the dwarf lily and Crypto wenditii. Many of my stems developed weak roots, and bare lower stems suggesting insufficient light.
What’s the link to your journal?
Your symptoms might actually suggest a lack of sufficient Co2 according to this page 2hr Aquarist
coupled with phosphorus deficiency.
For the red plants being green, I'm actually going through the same deal on my tank.
I can keep ludwigia rubin, natans super red, and AR mini red, but rotala rotundifolia 'red' is just as green as the 'green' type I have growing. Same with ludwigia arcuata They are in the whole transition phase from emersed to submersed so it's hard to tell.
For light I have 36 4000k 3 watt LED stars running over my 55 gallon.
I don't know par, but visually it is brighter then my LFS' 250 watt MH lamps over their reef tanks run at 90% for 4 hours a day and 70% for 3.5 hours a day.
So unless I'm grossly misunderstanding how much light I actually have I don't know that high light is 100% the way to get red plants to turn red, right now I'm looking into it maybe being a fert related issue also in my tank, the plants don't exactly grow as expected, even though they're growing like weeds. I suspect it's probably a Co2 issue despite everything pearling like crazy.
For the topic of the thread:
Red plants that grow more red then green in low-medium light conditions that I've grown
Ludwigia rubin, natans super red
Crypt tropica (more a purple/red color)
Under lower light conditions these will grow into more a brown/red color then the bright red you might be expecting though.