I don't have any personal experience with your light but it seems like its enough to grow some nice buds in a 3x3. In my opinion the biggest factors affecting yield are genetics and plant health, if your plants are sick you are going to be backing off whatever light you have. Are some of the more expensive lights better? Of course they are they are the spectrums are designed better and they disperse the light more evenly, maybe penetrate a little deeper, better components, etc I run Mars Hydros which are far from the top of the line but enough to grow some nice stuff. That being said my advice to people starting out is lock down your environment avoid big temp and humidity swings, keep root zone ph in the proper range, keep your lights at a reasonable distance and don't throw the kitchen sink at them with nutrients and additives there is a lot of snake oil out there and a hundred people who swear they work miracles everything you dump in there is something you potentially have to flush out so go easy ( i speak from bitter experience here). If you keep your girls happy and healthy Ill bet your going to be pleased at the end. Good luck with your grow I think your on the right track