flowering early is done for grows with limited space for the plants and/or to make it flower sooner for quicker turnaround after vegging the first 2 weeks (or 12/12 from seed, which is extremely dumb imo, the plant still needs to veg and reach maturity b4 it starts to flower, all 12/12 from seed does is make it veg w/ only12 hrs of light instead of 24) and then instead of waiting till it matures fully and shows pre-flowers to switch to 12/12. so it depends on what you wanna do. the plant triples in size by the end of flowering. you probally said this somewhere on here but i dont feel like looking through 30 posts to find it cuz im kinda lazy. lol.-how much space you have? i wait about 4-6 weeks to flower depending on how things go for me during veg. i keep my lights really close so they are usually VERY short and bushy. which is great. 6 inches is probally about the right height height i flower at, but they have so many branches and nodes and big healthy fan leaves on them with about a cm of stem above soil that doesnt have leaves. the rest of the way up the nodes are about 1/2-1/4 of a centimeter between them. each plant has 3-6 42w 2700k and 1-2 6500k bulbs positioned around it for both veg and flowering. color spectrum is not quite as important as some think imo, my plants do great w/mixed spectrum