Been Growing for a year now, Have about 38 harvest under my personal belt. I grow for the medical community. I will veg until they mature and a week or two more after that, so around 3mo. They must be at least 18"high before I consider movong them over. Puts out 5000 lumens. It's the greatest for veg. I can veg and veged over 2' plants with no problems (heat, light penetration).