With 85 watts I would recommend just doing 1 plant. As it will greatly increase your plants growth and yield. Also you need Blue Spectrum for Veggin and Red Spectrum for flowering. Unless it can do both spectrums then no it won't be successfull. Also there are many things that you must keep in mind for a good grow. Space, Reflection, Temp, & Nutes. 1 85 watt CFL of both red and blue spectrum could very well grow a decent yielding plant w/ the right accomadations(sp?).