Leafs curling down

Hi there, at this point i would say it's not really something to worry about, but definitely keep an eye on it, how it evolves.. just make sure that there is good water drainage in the cups, so the roots don't stand in the water.. cannabis doesn't like that (you can make some holes into the bottom, and then place the cup into a second cup so the water can rinse out in case it's too much). Also don't overwater them (this can cause droopy leaves as well). Wait until the cup is fully dry again before re-watering. What is the humidity in your room? At this age it's better to still have a higher humidity (around 60 to 75%). I think it was good that you have already lowered the intensity of the light (and temperature).