Hey, buddy! 👋
Ultraviolet is essential for metabolism and plant growth. This part of the spectrum prevents stem stretching and increases the vitamin C content in the plant, acting on the plant like low temperatures, hardening its resistance to the cold!
I used a multi-spectrum matrix 50w with blue + red + ultraviolet + infrared - it's a good stress for the plant during adult vegetation and flowering! But for a seedling - it's too intense of a light! 👆
Good luck, bro!