Should I go with a bigger or smaller grow tent?

So my plan is to go with a grow tent. That is temporary, but i need to get up and running sooner then later. I'm interested in advice in how big I should go. I'm not looking for a commercial size harvest as I only provide for one patient. My plan is to run a 600 watt light. I've looked at 4.5 x 4.5ft grow tents and 6 x 6 ft tents. I don't think I need to go any bigger. I also have a seperate area to start clones and maintain mothers this would strictly be a veg/ flower area. So the question is will I waste light by going too big? I need to be as efficient as possible, so any advice would be great. I truly appreciate the help.

if 6x6 isn't a problem then go for it. that's prime lighting for a nice set of plants, and you have space to go perpetual and still crop nicely. even if it's only for two people, excess can always be made into hash, edibles, or clothing.

Thanks for the advice, the poll was kind of a flop. Oh well I'm gonna do 76" x 76" and hope for the best.