Throw distance
Every projector has a minimum distance from which it can project to a wall or screen clearly. Short-throw projectors only need a few feet of space, making them better suited for smaller rooms. Ultra short-throw models can cut that distance down to just a few inches.
Bright picture
You shouldn’t have to turn off all the lights and cover the windows to see your projector’s image. Look for a projector with a brightness of at least 4,000 lumens to ensure a good image in a range of conditions.
Advanced light source
The most common light source for many types of projectors used to be mercury bulb lamps. LED light sources have since become common. For the highest possible image quality, a modern laser projector may be the best choice.