Ok, so basically I don't do well with light in the morning. Pretty much any light will wake me up and its a bit annoying if say the sun rises at 5am and you're trying to sleep until 7:30. And maybe 2 or 3 years ago I was looking all over the internet, including in this forum for things that would totally blackout all of the light coming in through my windows, and I didn't really find anything. There were a couple of massively involved curtains with boxes on all sides that you could attach to the wall, but that was about it if you were looking for blackout. And even those had a little bit of light leaking around the sides. Fast forward to a month ago when I tried searching for something again when I was getting particularly annoyed with sun hitting me right in the face in the early morning when my blinds weren't in the exact right spot, and lo and behold- I actually find something this time. A google search for "blackout window" brought me to the "Blackout EZ" website.
The bottom line is that the product is incredibly brilliant in its simplicity, and works perfectly. The cliff's notes version of it is that it is a light blocking multi layer vinyl (or whatever) fabric panel that you cut to the size of your window frame, and then attach with velcro on all sides. HOLY CRAP- This thing works incredibly well. My room is an absolute cave. Not even that slight little ray of light peeking around the edge you get if you try to use curtains. If your goal is to simply block off 100% of the light entering through your window, period, this does it. Install is really simple- They give you two rolls of adhesive velcro, and you just cut the panel to fit your window, using the printed grid on the material as a guide, throw on the velcro and you're good to go. It's so simple, but noone thought to put it out before. The velcro guarantees that no light at all can ever get through around the edges.
I tried searching for it on this forum but nothing came up. If you're looking for a cheap (around $20 or $30 per window) way to COMPLETELY guarantee absolutely no ambient light at all in any daylight condition for a home theater/ projector setting, and you are particularly sensitive about room light based on your calibration, I really can't think of a better way to do it. It was apparently made mainly for night shift type folks who need to sleep during the day so it probably doesn't come up as a home theater accessory that often. That and the fact that it's probably only about a year or so old based on the age of the website. Anyway, I've had it for probably a week or so, and it's actually kind of hard to explain what having a complete and utter lack of light through a window does to a room, when youre used to at best blocking 95 or 98% of it, with it peeking around the sides of whatever curtain you've managed to put up. I cannot recommend it enough.
the website: http://www.blackoutez.com/