What state are you? I am a newbie so take this with a grain of salt, It would work, but its not the optimal thing to do. NPK is Nitrogen/Phosphurus/Pottasium. I think you would want a better Nitrogen ration for Veg More like a 2-1-1 (roughly) like 14-7-7 or 12-7-7 I thin for Flowering you want more Phosphurus, less Nitrogen so perhaps a 2-8-4. Now Take in mind I am a newbie, but I been doing all this research. I plan on using Fox Farm products: See at HTGSupply.com

Please take this with a grain of salt, I am still learning. I use GOOGLE, and Jorge Cervantes book.