Except where noted, the following measurements were made with the lamp’s Eco setting off. The M311X is rated at 3100 lumens, and that rating was a bit overoptimistic based on our testing. We measured 2545 lumens in High Bright mode (the brightest) at full wide zoom. As our measurements are typically lower than the manufacturer’s rating, we consider anything within 10% of the rated output to be excellent. As the M311X measured almost 20% below its rating, the rating is a bit high, though not inconsistent with some of the competition. The output varied slightly going to the middle of the zoom range (where all subsequent measurements were taken), dropping to 2405 lumens. Going to full telephoto zoom resulted in a greater drop to 2109 lumens. On the plus side, there was little variation in brightness across the full image. Also, the M311X’s High Bright mode is as good as some projectors’ Presentation mode, so you’ll be able to take full advantage of the available lumen output for almost any presentation.
Using Presentation mode, the output dropped to 2144 lumens. Movie mode, which provides the best color balance for video presentation, dropped to 1792 lumens. Graphic mode came in at 1690 lumens, sRGB (equal to Movie mode in color balance) at 1769 lumens and Dicom Sim mode was 1690 lumens. Video mode experienced the biggest drop, down to 1509 lumens.
There are four settings for the Eco lamp mode: Off, Auto, Normal and Eco. In Auto mode, the projector switches from Off to Normal depending on the picture level, so there are essentially three lamp levels. Changing the Eco lamp from Off to on Normal mode resulted in a 24.5% drop in lumen output to 1815 lumens in High Bright mode. Going to Eco mode dropped the output to 1304 lumens, a 45.7% drop from the lamp output with the Eco mode off, which is a greater drop than normal for most Eco modes. Nonetheless, 1304 lumens is enough for any presentation environments with even a modicum of light control and enables the user to take advantage of the M311X’s 10,000 hour lamp life.