Hello my friend
The light does not make a precise diagnosis but your plant looks beautiful but I can give you some tips for your watering
To calculate how much water each plant needs, follow this rule:
The volume of water to be given during each watering must represent at least about a quarter of the volume of the pot !!
Examples:
for a pot of 1L, give 0.25L of water at each watering
for a pot of 4L, give 1L of water to each watering
for a pot of 12L, give 3L of water with each watering
for a pot of 30L, give 7.5L of water with each watering!
etc ...