I would like to suggest that you take some time to research and study the stickies and other posts on this forum. This and the question about incandescent lights you asked are very basic questions. If you take some time to read and learn, you will find that you will learn the answers to most of your questions. Then if you have specific questions about your grow, you can post them and not be harrassed by trolls for not doing your own research. Good Luck my friend.