InFocus IN5148HD Projector Review - Performance

Brightness

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