I am looking for some material to make my 80x70 sliding door window completely light unintrudable(or very close) for use with my projector. I've been searching the internet for a few days looking for stuff, but I really have no idea what to look for because everything I find is pretty vague. If someone with experience with this can help me, I would great appreciate some help. I am looking for something completely light-free(or very close), looks good, and will allow me to get through the door without a huge struggle each time. I want to not be able to tell the difference between night and day in this room. Thanks.