Short story: I'm guessing low to low-medium light plants.
Long story: I'm basing that on a tank height of 16" and the PAR chart for LEDs on this link: http://www.plantedtank.net/forums/sh...d.php?t=184368
(Need to scroll down quite a bit to see it).
Regarding PAR (Photosynthetically Active Radiation), low, medium, and high light ranges generally are 10-30, 30-80, and 80+, respectively.
A single 24" ML double bright will have about ~25 PAR at 16" according to the chart. If there are two fixtures I'm not sure that you could simply assume the PAR value is 50. PAR values are stated for directly below the light source and they decrease the further away you get from directly under the light. There will be some overlap of light from the two fixtures as well.
So anywhere from 30-50 PAR can be expected which puts it at the low end of medium light.
As for plants, this includes, but not limited to, swords, crypts, mosses, Vals, sag, less demanding stem plants.
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