Neoprene cuff is 3 inches (7.5cm) in diameter.
Seedling is short but leaf span is quite large.
Spider Farmer 100W light is at a distance of 20 inches, dimmed to 40%.
I had difficulties to keep the water temperature down, hence dry leaves at the bottom.
Now it looks like feeding solution isn't strong enough, I upped it today to 2ml/litre for each nutrient.
Although seedling is quite small, it has very strong smell.