Unless your breeding for seeds kill it asap. if you are breeding what strain is it? if it's a bag seed kill it. Don't get attached to your plants. If your breeding isolate it from the others. The two smaller ones look nice, buts we do need better pics to tell for sure. IMHO I would top the two...
I agree with Tank although mylar is nice is does not hold up to the wear and tear. Kilz makes a good flat white paint the will have a 95% reflectivity it's hard to beat. When things get covered in grow room reside, you just apply a new coat and your good to go.
Happy Growing!
Whats the formula for sizing? my room is 16'x 8'x 8'. 2"x 4" stud wall construction with a vapor seal and R-13 insulation. Drywall ceiling with two layers of R-19 6 1/2" insulation. It's built inside a block walled garage. 2800 watts of lighting total. All HID's are open Bat wing reflectors. Veg...