Knowing when your plant is ready to be flipped from veg growth to bloom is one of the most important decisions you will make. The foil will act like a small greenhouse, keeping the inside of your pot warm and moist. You can put seedlings under HPS or MH light, but I would only suggest this if you already have the lights. Source: https://rinoplastikanosa.ru/2024/02/07/the-ultimate-guide-to-buying-and-growing-cannabis-seeds