the idea with the bubble sounds good,as 4 it cutting out the light i honestly dont know but my ghouse is made from 3 ply poly and it works great,also a lot of people whitewash their ghouses. my gh isnt that well hidden but its not in yr face and only 3 friends who also gh grow know that i grow but im not worried about it bin seen,but my worst nightmare is it gettin stolen.what strain u growing?