The MarsHydro 300 old style 3x100 white will veg a 3x3 area and flower a 2x2 area, is what I was told by MarsHydro. I have one, love it, I run it in a 2x4 tent. Ive had great results with the one, and just ordered another off ebay that is going to round out my tent in a big way. For your first grow, the old style marshydro is a good starter light, inexpensive too if you can find one. MarsHydro does not sell them anymore, so used is the only option. They do have a MarsII 300 with 5 watt chips, but actual draw is like 130 compared to 180 with the old style. Have to run the 5W a little higher too if height is an issue. Good luck.