smoke24answered grow question 4 years ago the ts 1000 will cover a 3x3 ft area at veg heights, the problem is when you have to go down to flowering heights the coverage area drops a fair amount, You could use the ts 1000 for 4 plants but during flower you would have to rotate the pots 180 degrees every day in order to get even light coverage. Ideally in a 4x4 tent you would want a ts 2000, or in a 2x4 tent an sp3000 would be perfect. Happy growing.