Hey bro! 👋 You can start using powerful lighting from the second week, but I recommend keeping the lamp higher from the plant. Measure the light intensity with a smartphone app lux meter, it's cheap and effective. The readings shouldn't be above 20000 lux. From the end of the third week, you can lower the lamp and increase the light intensity up to 90000 lux. 👌😇👍 Good luck, bro!