Sophronitis riograndensis struggling

[rbarata]

Originally Posted by poluekt_sovranski

As for the light, its under the led light 12 hours (at ca. 90 umol/m2/s) but also it receives indirect sunlight in summer during the day (ca. 140) and this season it has 2-3 hours of filtered direct sunlight (because of season change).

I'm not an expert on artificial lightning but making some conversions it seems the light you are giving it is too weak.
It depends on the type of leds, I think, but anything under 1000 fc is certainly not enough.
Let the lighting experts give their input.

How far is the plant from the light source?