Okay so after messing with the unit for some time to push it to its max ability, it was time to throw in some test material. Here are my observations in regards to the commonly discussed parameters:BLACK LEVELS/CONTRAST:
First off, LED's have another distinct advantage over lamps.they can be turned fully off on the fly. This basically means infinite on/off contrast when going between scenes of material and black scenes (take for instance the beginning of Disney/Pixar's Cars). In such scenes like this, it brings a whole new depth to the movies. Now, I know you are asking yourself how many movies due that type of rapid to black and back scenes? Well, few that I know of, but read on. Runco utilizes a ConstantContrast system in this model. There are several settings (Low, Medium, High and Off) so a person can make it the way they want. The High mode is what achieves the infinite on/off contrast. But, one may not like that, so you can simply dial to one of the other modes, and the projector will only put the LED's into their lowest non-off power state during black scenes. The Medium mode is the next aggressive, so I took measurements in this mode such that I could get what I refer to as a real world on/off contrast. As you can see from the chart below, it is amongst the highest for any single-chip DLP made (if not the highest). Kudos to Runco for this accomplishment. Personally I preferred this Medium mode as it was a bit smoother transition between dark and light scenes than when going to full off, and since your eye doesn't adjust all that fast, it still appeared black.
When one thinks of DLP and contrast, they usually think ANSI contrast benefits. DLP technology has the highest overall ANSI contrast ability of any digital technology. Now I did measure the ANSI, but note that ANSI is EXTREMELY difficult to measure consistently and accurately. That being said, the results may actually be low for this unit (my room is dark, but not a pure black cave). As you can see from the below chart, it didn't disappoint. Though it wasn't the highest ANSI contrast I have measured to date, it still was higher than any other digital technology and it certainly translated to a very 3D look to the image.LIGHT OUTPUT:
This is where the one limitation to LED is in their current statethey aren't overly bright. This particular unit tested decently, but I would limit the screen size to something it can manage (many factors come into play there). I will say though that LED's, unlike lamp based projectors, do not really dim over time. In fact, at the 50000 or so hour rating, there is only approximately a 5% decrease in brightness. So say you have a UHP based projector rated at 700 lumens. Over about 300-400 hours and beyond, that will actually be DIMMER than a 550ish lumen LED. Essentially one really has to look at more long-term when it comes to comparing LED with lamp based units when considering brightness. Plus this is a new technology, as LED's improve over the coming years that will in turn be able to be used with larger and larger screens and quite possibly could make lamp based projectors a thing of the past.COLORS:
I touched upon this briefly earlier in the calibration discussion. Because LED's have such a large color gamut capability, one can really set the Q750i to about anything that they could ever want in regards to colors. Personally as and ISF guy, I prefer the standardsit is what I am used to. But, as you will see in some of the screen shots below, the expanded Native mode of the Q750i can certainly give a new life to certain content. All in all, there is basically nothing one cannot achieve with this projector when it comes to their preferences of color. Heck, say your eyes are blue deficient, you could simply go in and fine tune to your own preference to accommodate for that. Very slick and VERY versatile. One comment I will make is that for whatever reason, LED's projectors, even if calibrated exactly to Rec. 709, still tend to have what I would describe as a larger gradient in the colors. In other words, there seems to be more shades of each color available when reproducing content. It's really hard to put into words but if one was to do a side by side with a lamp based projector, both being setup as identical as possible, they would see the difference.SHARPNESS:
Another big advantage to DLP technology is they are simply the sharpest out there. Moreover, single chip's specifically are the sharpest because there is no panel misconvergence to soften the image. Basically the only limiting factors of what a single chip DLP can do in this regard are the lens itself and the video processing used in the projector. In the case of the Q750i, the lens is top notch. I threw up a single line grid test pattern and standing right up on the screen I saw very distinct pixels and virtually no chromatic aberration (another sign of a good lens). This translated to the picture. When viewing material the Q750i gave a very defined image, showing lots of nuances of the image that in some other technologies tend to be more difficult to detect.