supplementary

I am about to do a 2x2x6 grow, and have bought the spiderfarmers SF1000. They say it can veg 2.5x2.5 and Flower 2x2, but from what ive read, it can barely Flower in a 2x2, so i want some supplementary lighting for the Flower period (im doing autos). What would u recommend? CFL 2700K? Led light...