So it's possible to run 4x 1000 hid in the tent or is it over the top? Also what's Scrog stand for?
I think 4 is over doing it, I understand more light bigger buds etc but to an extent. A 1000w will handle 4x4 area well so 2 would do good. I'd go 3 if I needed but not 4, to much fans, heat to worry about and in my opinion over kill. Screen of green, look it up creates a lot of cola top bud sites. Makes canopy nice and even and makes it easier to lower and make lights higher since canopy the same all across pretty much. If you decide to go a different way, toss a hps and buy some side lighting for lower parts to fill in space with lights. I'm sure there will plenty more replies with help.
Forgot to ask your 5 gallon bucket, is this soil, soiless how are you growing besides your lighting? if soil how do you plan to water and do the run off etc in a tent without moving them all in and out each time etc?
What's cfm or your fan you are using for that size?
Don't forget to add up your amperage you don't want to blow anything. Each one of those lights on a 120 will draw a little over 9 amps each. Plus amps from fans,circulating fans and what ever else you run. Don't want to burn your house down. A tent can get very hot.