Don't believe all the Amazon reviews. A light like that requires close to 50W/square foot to provide decent results in flower and that light is only going to provide you with 27.2W/square foot in a 3x3 tent. Two of those lights running during flower would give you much better results. It's also worth mentioning that autos are not easier and are often not recommended for beginners. The only "easier" thing about autos is that you don't have to change the lighting schedule to 12/12 to get them to start flowering.
