firstly , i think you should be aware of the marijuana's growing period , about this , you can easily google it . second i hold the idea that the proper choice of light aborting during the growing phase. in fact ,i have some experience on this area ., also i can tell you how to choose a best led grow light to fasten this process. feel free to contact me about the led plant grow.
You can't get all of the information from a forum buddy. You will need to read and understand every aspect of what your dealing with. Knowledge is power and there are books, articles, scientific research that I would listen to over people on a forum. I'm not trying to be rude but most people stink at growing. If you want to beat the common man you simply just have to read more and learn more then him.
Check out the organics subforums, great place to start reading, resources for downloading some books, as well as some great information with sources included to check up on facts.