Portable Projector Review
Brightness and Presentation Picture Quality: Our M250 test unit produced 2,337 ANSI lumens in its brightest configuration, with was a combination of Bright lamp, the Dynamic color preset, and the 'Warm2' color temperature setting. This light output is just shy (93%) of the 2,500 lumen spec. Switching to ECO mode drops light output to 2,033 ANSI-lumens, which is only a 13% drop from the full power mode, and not much to sacrifice to get the expected 5000 hour lamp life.
The M250 produces enough light to accommodate a variety of different rooms and screen sizes. On a 150-inch diagonal, unity gain, 4:3 screen, the M250 can produce image brightness above 30-foot lamberts, which is bright enough for situations with moderate amounts of ambient light.
From an overall image quality standpoint, the M250's primary strength is the display of static presentation material. The color reproduction in the Dynamic image preset has a visible blue tint, yet I did not find it distracting when viewing text or simple graphics-based presentation material. For display material that requires a more balanced color palette (such as viewing photographs), I preferred the Standard image preset. Light output drops to 1,126 ANSI lumens in this mode, but that is still enough to maintain a 30 ft-lambert brightness level on a 100-inch diagonal 4:3 screen.
With an offset of approximately 14% of screen height, the bottom edge of a 100" diagonal image will be about 8.5" above the centerline of the lens when used in a tabletop configuration. This placement is convenience for most tabletop uses, and should in most cases avoid the need to tilt the projector or use keystone corrections. The M250 features a 1.2 zoom lens and a throw ratio between 1.5 to 1.8. It can throw a 100-inch diagonal image between 9.9 and 11.9 feet from the screen. Lens performance is good, pixel edges are clearly discernable when examined close up, and the image is sharp across the entire width of the screen. No chromatic aberration was noticed.
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