Cool, keep us posted.. what temperatures are you using for the kratom? I know that LEDs can degrade faster at higher temps but I'm not sure what those are... Maybe BigBlock can enlighten us. Cannabis only really needs 60-70F to do well depending on strain.

Have you noticed any increase in growth since using the LEDs? They're your plants but for experimental reasons you could try covering up the fluorescent a bit so it's still generating heat but not shining much on the plants.