BENQ LU710 has a rated brightness of 4,000 lumens. I took 3-4 readings about 15-20% out from the center of the lens which usually gives a pretty good approximation of ANSI lumens. At full wide angle I measured the LU710 in its brightest picture mode, BRIGHT, with the lamp power set to NORMAL.
BENQ LU710 Brightness: 3634 Lumens
At wide zoom, BRIGHT mode, the LU710 measured 3634 lumens. While LU710 was a few hundred lumens below its rated brightness, it should be more than bright enough for most intended applications. For the seven available modes, I also measured them at mid-zoom since it is common for a projector to be zoomed in a bit when installed.
Brightness at mid-zoom
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The BENQ LU710 has a claimed dynamic contrast ratio of 3,000,000:1. The higher dynamic contrast is done by modulating light output of the projector’s laser light engine. When the LU710 encounters a “black frame” of information, it can shut down the laser engine completely projecting a true black frame. This feature is listed as Dynamic Dimming in the projector’s menu.
The LU710’s black levels were closer to a dark grey than a pure black, but I didn’t expect a sub $2,000 business projector to rival the black levels of a home theater projector. The LU710 did a nice good job reproducing subtle shadow details in dark video scenes.
In the average meeting room, which normally has some ambient light, the black level is good enough to be recognizable as black. While the blacks were not super deep, due to the fact it was capable of delivering nearly 4,000 lumens of brightness, the overall contrast of the BenQ LU710 would be more than enough the satisfy the average user.