I'm moving to outside grow and I'm going to move my box out there. It's reflective interior will help gather the sun light and I can put a shade cloth over it if the sun is too much, and it will protect them from winds...
It's just three sides and no top.

My theory anyway. I always was working on the assumption that I needed all the reflectivity I could get when growing in the box. All interior surfaces were reflective material and I think it help with the growth. I only use T5 so I need all the help I can get.