I have a very similar grow going on right now, hopefully this gives u some insight as to what ur in for.
OK SO HERE WE GO
my current grow
4x4 tent 7ft tall
1000w MH Veg - 1000w HPS Hortilux Flower - cobra hood - lumatek ballast
Using ReadyGro Aeration Formula by Botanicare
7 x Tripple OG Plants (Indica Dominant)
I started off with 8 as u can see in this pic but i soon realized this wasnt enough space for 8 flowering plants, they are extremely bushy plants. most as wide as the were tall.
This is a picture of day 45 The last day of veg, still 8 plants. You can begin to see that flowering all these plants is going to be difficult in the 4x4.
I believe this picture is about half way through flower, day 30-40 under 12/12 1000W HPS. By this time I had Already taken out the 8th plant. You can clearly see the tent is maxed out, at least from the canopy's point of view.
This is an undershot of the canopy. a lot of lollipopping was done as you can see.
Keep in mind these plants were untrained, i will be using a scrog net for the redemption grow, i will also be growing less plants. im thinking maybe 4 of this same strain with the same setup. I feel like my yield for each plant was cut dramatically due to space issues, but also light issues (not having enough light penetration going through the canopy to lower bud sights.) So im looking at alot of nice tops but the under sides are garbage...underdeveloped buds unfortunately.
My personal opinion on your situation, is that I do not think you will have enough light provided for 7 medium sized flowering plants.
If it was me it would come down to either upgrading the lighting system, or getting rid of at least a couple of these plants to allow for optimal flowering conditions. Keep in mind that if you have the space and proper weather conditions, throwing a flowering plant outdoors is worth a shot. My 8th plant i actually waited on purpose to throw it outdoors. I waiting until about 3 weeks into flower for 1. to make sure that i did not have enough room. 2 - if it didnt i knew i could always throw it outside and hope for the best. HOPE THIS HELPS