If you are interested in growing marijuana under an artificial light this book is for you. It contains all the necessary information for experienced and beginner growers. It doesn't matter if you are a newbie or a veteran grower - inside this book you will find useful and interesting information gathered by the author and experts from all over the world, in more than twenty years of cannabis growing. In addition, you'll discover a number of techniques and methods for improving your yields and growing organically. In this completely revised and updated edition of my book, the information is written in a clear and understandable way.