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  Home Theatre Projectors, Dell, InFocus and Sanyo 
  Nov 14, 2003, 09:30am EST 

Results, lumen output

By: Sander Sassen

The results we measured for the lumen output, contrast and noise levels are a little different from the specifications from the manufacturers. Let’s first look at the lumen output. We’ve used the official ansi-lumen method to measure lumen output at 9 different points on the projection screen. The ansi-lumen method simply calculates the lumen output by looking at the average lumen output of those 9 points with the projector projecting a white screen and factoring in the surface area of the projected image. We used a professional Minolta lux meter to determine the amount of light at these nine points of the screen. Because lux is lumen-per-square-meter we just needed to factor in the surface area to be able to calculate the total lumen output. We’ve also looked at the total deviation from the center of the image and what projector has least variance in lumen output across the screen.

Fig 1. Lumen output and contrast, notice how the InFocus has the least output variance across the screen.

What is obvious from the results you see in the table is that all projectors have a lumen output variance across the screen, and that, contrary to what you'd expect, the highest output is not in the centre of the screen. On second thought this actually makes sense as all of the projectors are designed to project upwards at an angle so that they’ll also be able to project an image standing on a table off axis to the projection screen. Most noteable is the excellent lumen output variance results of the InFocus projector, no more than 0.3% on average, whereas the Dell performs worst with no less than 11.1%. One other thing to note is the high contrast ratio of both DLP projectors, excellent contrast is one of the strong points of DLP technology.

1. Introduction
2. Lumen output
3. Contrast
4. Resolution
5. Noise levels
6. LCD, liquid crystal display
7. DLP, digital light processing
8. How we tested
9. Results, lumen output
10. Results, specifications
11. Conclusion

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