if you are only using low watt small lights i reckon your ok to veg a little , you can give it some lst. my box is only 3ft tall and i got 2x 70 watt hps and 2 200 watt enviros in there no probs and i veg for 4-5 weeks2 6500k 23 watt and a 3000k 20 watt cfl. Im getting things as i go.