My only concern is space. I am building in a cabinet and have not a lot of room for 90degree pvc's to be going everywhere. Will one 90 degree work with an extension that goes straight up with maybe a black pantyhose like material over the top to help keep dust out work? I thought light doesn't bend around corners and a 90 is definately a corner. Please let me know. I will go with a different option if need be but rather use only one if at all possible. Thanks again for the help.