I'm no expert, but I think you would need a projector with a 2.0:1 zoom lens minimum. I just picked picked up a Panasonic PT-F300U on Ebay for $235 shipped. It is 4000 lumens, 600:1 contrast with a 2.1:1 lens. It will hit 12' (144" diagonal) from 15 - 30 feet. At 4k lumens, it's plenty bright. It is an XGA (1024 x 768), not 720p projector and contrast is a bit low, but it throws an incredible picture. It is native 4:3 but it displays 16:9 very well. For the price and what it does, it's a great BYT projector (plus, replacement lamps are less than $100). Here are a couple of pics fyi. The screen shots are were taken at 2:00 pm shot on my bedroom wall. You will see that the circumstances are nothing like outdoors at night but the picture still looks good. I'm replacing my 130" screen with a 165" screen and will shoot 22 feet.