They don't make this one anymore cause it was too bright - the new ones are only 600 lumans 3000 lumans. portable. I've used in broad daylight or can run off AC power or I have a portable battery pack 150 WH that you can rent a la cart While you can project a 150-inch image you're going to get a much better picture projecting in the 55- to 75-inch range. Rated at 3,000 lumens, the projector is fairly bright, particularly for a projector of its size, but as usual you'll want to use it in as dark a situation as possible to minimize image washout. The 4-pound (1.82 kg) projector has a native resolution of 1,280x800 pixels or 800p and the images I projected were fairly sharp, but not as good as real HD. There was little bit of softness that made you feel like you were watching something in between a DVD and a Blu-ray, especially at larger sizes. What's cool about the projector is that there are a number of ways to get video to run through it. It's powered by an Android-based operating system and has built-in Wi-Fi, so you can stream content right from the projector via apps like Netflix and YouTube (more adventurous users can sideload additional Android apps that aren't in the Nebula's download library).