Lighting help for grow tent?

I'm starting up a new grow tent I have one already. It's a 4'x3'x7' with a 400watt hps light in it. The new tent I'm looking into getting is a 5'x5'x6'8". My question is what size lighting should I get. Electricity bill is an issue so I don't really want to get 1000watt hps but I was thinking should I get 1 600watt hps or 2 400watt hps lights? I don't know which would be better. IMO I think the 2 400 watts would be better because you would get a bigger light footprint and more wattage. but I'm kinda on a tight budget so I'm thinking I should go for the 600 watt. I want to get better yield so that's what made me think of the 2 400 watts but I just don't know. I need someones opinion that has more growing experience then I do. Thanks in advanced for the help.

I'm a noob myself but what i would think is how tall is the grow going to be? if i was growing tall tree like plants i would get the 600w but if i was growing small or doing some kind of training to keep the canopy small i would use the two 400w. but like i said, im a noob and thats just my opinion.

Flower clones at 7" tall and LST during the 12/12 stretch to keep your plants under 2ft tall.

Keep your existing 400w and add another 400w to cover the entire area. You will end up with a cross over footprint in the centre where the plants will more than likely need extra feeding. But will average more yield from them.

With a 600w you could only cover 3.5ftx3.5ft with around 4-6 3ft plants.

You could have 8-10 2ft plants under 2x400w. Pulling more weight in total.



No brainer in my eyes.



J

yea im going to do smal trained plants. Im starting to learn to train plants with topping and fimming and defoilation. Ive learned that i can get more yield out of a smaller grow space that way and i dont have much grow space but i do have a good enough amount to grow a good amount of plants. and thats what i thought jondamon. I was just unsure. thanks for the advice. it would be cheaper that way also.