Thanks. I understand natural planted tanks, but not anagrams
. Must try to remember this one. Took me ages before I figured out what this "lol" was that kept showing up on so many posts.
Plants can grow under practically any light if it has sufficient intensity and duration, but providing close to what they actually need will get better results for less. Diana Walstad who basically got people into soil substrate tanks as you know writes that she looks for tubes with a Kelvin between 5000K and 7000K and/or a CRI of 80 to 100.
As Barb mentioned, the Flora-Glo is 2800K which is very warm. But that is just our perception of colour, the real issue is intensity, and I can't track this down but from memory this tube, like the Aqua-Glo, are about half the intensity of the "daylight" or full spectrum tubes. I use the one Barb mentioned, Life-Glo which is 6700K so within Diana's suggested range. The advantage with this tube is the intense light in the red and blue which plants need, plus the balance with green for a true rendition of fish and plant colours. Hagen says this tube replicates mid-day sun, and the studies I have seen support this.
Using a Flora-Glo equates to half the light intensity that the same sized Life-Glo would provide. And that is significant to the plants. I don't personally like the purplish hue that these Aqua and Flora tubes give to the aquarium, but others may. It would just take more of them to provide sufficient light for the plants.
You can read more in my article "A Basic Approach to the Natural Planted Aquarium" in 4 stickies at the head of the Aquarium Plants section.