The guys at Green Coast Hydro recommended to me the 30x since anything more is a real pain in the ass to use. You have to have perfect light, hold everything perfectly still, and it takes a lot of practice. I bought the 30x lighted handheld and it works just fine for me. GreenCoast Hydroponics, Hydroponic Systems - Grow Lights, Advanced Nutrients and Green Air Products if you wanna check them out on the web