flat scrog is when you use a flat mesh screen above the plants, v scrog is when you use a v shape screen and your plants grow in a v shape along the sides of your lamp and i find if you use a coolshade (lamp in a glass tube with fans to remove the warm air works best. stadium scrog is where yo grow the same as v scrog but the plants grow along the sides and across the ends. i find that stadium scrog is the best for me you can extend it as you need to by adding another coolshade and the buds all recieve the same anount of light and are all the same distance away from the light so stetching is avoided. hope that makes sense to you and helps you out.:thumbsup: