I'd go with two lights, not one. More options dealing with different plants. What kind of grow are you thinking of? SOG might work well in 3x5. Do you have access from both sides of the tent? Or if not SOG, 6 plants in 2x3 configuration might work nicely with size control. It might be a challenge to get two across 3 feet if the girls were big. OTOH, snippers work if nothing else does.
Good luck with the light shopping.