Use fluorescent light for vegging and get a 250w HPS for flowering, this is OK for 4 plants. 250w lamps are pretty cheap, you can get them for about £80 - £120 (don't know what that is in $$$).
You can get light systems which will run both MH and HPS but usually only newer systems do this, older systems will not.
GTC21 Reviewed by GTC21 on . Need help. Few questions. Okay guys, I am very new to the cannabis scene but I learn really fast. I already know most of the growing info I'm going to need but I do however have a few questions I would love to have answered. 1. What does 20/20/20 in soil mean? (I was lead to believe its the soil:fert:sand/perlite ratio. Please correct me if I'm wrong.) 2. What is the best way to germinate a seed? 3. How big of a pot would I need to grow about a 4 or so foot plant? 4. The local shop around here has the Rating: 5