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InFocus IN5148HD Projector Review - Performance

Posted on January 28, 2017 by Art Feierman
InFocus IN5148HD Projector Review - Performance:  Brightness, Audible Noise


InFocus IN5148HD Brightness
Picture Mode White Lumens Color Lumens Color Temp.
 Bright  4106  1271  5855K
 Presentation  1706  *  6878K
 Video  1676  1500  6152K
 User  1722 *  6866K
 Whiteboard  2751 *  6054K
Blackboard 2929 * 6854K
 Beige Wall  2460 *  7917K


* Color Brightness was only measured for the "Bright" and "Video" Picture Modes.

As we have noted in reviews of other business and education class DLP projectors that use a single micro-display chip in combination with a color wheel that includes a clear segment, the whites and less saturated colors within the image can get a big boost in brightness.

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However, more heavily saturated colors can appear far too dark relative to the whites and lighter shades.  I found the IN5148HD to be an example for this situation, especially in its brighter picture modes, with the most extreme case being for the "Bright" picture mode.  The more accurate picture modes, including "Video" picture mode, exhibited less white boost and offered a better balance between the whites and the saturated colors.  I have included in the table above both the measured white lumens as well as the measured color lumens as metrics for the picture brightness for the "Bright" and "Video" picture modes.  For more info on the subject of “color brightness” see our short video HERE.

The measurements in the table were made with the projector’s zoom lens at its mid-point and with the lamp in full power mode.   The projector's lamp had about 35 hours of use at the time the brightness measurements were made.  All of the user controls were set to their factory default positions.  Setting the lens for max. zoom increased the brightness by approx. 12%, while setting it to its minimum position decreased the brightness by approx. 24%.

Brightness uniformity was measured with the lens set for maximum zoom.  The uniformity was good with almost no brightness drop toward the left side of the image and a maximum of 18% drop measured at the bottom-right corner of the projected image.

I measured the brightness in Eco (low power) lamp mode at approx. 24% less than when operated in normal (high power) lamp mode.

Measurements for black level and contrast ratio (specific values not presented here) indicated that in video mode the results were a little better than for typical 3LCD business class projectors, but no better than average for a DLP projector of this class with blacks displayed as only a moderately dark grey.

Using a full white test image the color uniformity visually appeared very good.

In making the measurements for color temperature, I noted the color temperature tracked exceptionally well across the grey scale from near-black up to full white levels.  I did note that the projector's Red, Blue and Green gain adjustments did not function as expected, making it not possible calibrate for the ideal 6500K color temperature across the grey scale.  This is perhaps something that InFocus could address with a future firmware update.



Audible Noise

We do not measure the audible noise levels produced by the projectors being reviewed.  The InFocus IN5148HD is specified to produce a noise level of 32 dBa in high lamp mode.  The 'a' following dB means with an "a" weighting curve applied.  To me the subjective noise level from the IN5148HD sounded similar to some other business projectors with a rated noise level in the 35 dB range.  In any case, while the noise level is certainly very audible in a quiet room, it should not be loud enough to prove distracting when this projector is being used in the intended business environment.

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