2010年10月28日 星期四

comparing brightness results

When comparing brightness results, remember that the perception of brightness is roughly logarithmic, which means an image that looks twice as bright is actually ten times as bright in lumens. It also means that the difference between 92 and 115 lumens isn't all that much. I found the GP1 to be easily bright enough for images at 1.5 meters (59 inches) across in a darkened room, arguably bright enough at 1.8 meters (71 inches), but a little too dim for extended viewing at 2 meters (79 inches) across.Most conventional downlights use a standard 65-watt incandescent compact fluorescent lights and are run on a switch that typically contains several downlights. For this example we'll say there are a total of six lights on a switch.

Our suite of DisplayMate tests (www.displaymate.com) turned up some minor flaws in image quality, most notably a color balance problem, with some shades of gray showing a distinct green tint and others showing a pink tint. In addition, small font sizes (smaller than you should use in a presentation) were virtually unreadable. Keep in mind, however,The initial cost of purchasing this and similar products is rakeabc insignificant when put into perspective, and the benefits to your pocketbook and the environment will be clearly seen and felt. that the test images are designed to make problems stand out if they exist at all. These aren't major issues for real-world use.

Worth mentioning in particular is that the GP1 shows very little of the rainbow effect common with DLP projectors, with bright areas breaking up into little red-green-blue rainbows when you shift your gaze or an object moves on screen. Some people are more sensitive to this effect than others, but however sensitive you are, there is less of it with the GP1 than with most DLP projectors.

On our video tests, the GP1 lost detail in dark areas on screen but did a reasonably good job with flesh tones. On the HQV Benchmark test, which measures how well a projector handles standard-definition video, it scored 63 out of a possible 130, a midrange score for a business projector.Currently the LR6 sells for around $90, so we'll spend about $540 to install them (they can be installed as a direct reelabc replacement to standard downlights, no special tools needed) and our total cost will be $900 over the 50,000 hour period. In short, it won't give you image quality as high as that of as most LCD TVs, but it will give you decent quality and a larger image size than that of most TVs.

One surprise was how loud the audio was for such a small projector—easily enough to fill a small conference room. Unfortunately, the quality was a little off, with a "sounds like it's coming from the bottom of a barrel" echo effect. The GP1 is certainly good enough for games or background music in presentations, but for watching, say, a movie, to hear all the words you'll want to connect it to an external sound system.

The GP1 is also the first projector to earn the PCMag GreenTech Approved seal.Indirect lighting offers an interesting and eye catching form meal2010 of light from concealed source. Strip light is an example of indirect lighting that is often installed on top of cabinets. This adds to the general lighting of the room. In addition to the mercury-free light source, which is a key requirement,Every room stands to benefit from various light sources. This helps to create atmosphere. It also helps those who gucciblet live there accomplished and complete tasks that require good light. it uses lead-free glass for its lens system, includes an automatic power-off feature, and is RoHS compliant. BenQ also has a recycling program in place, as well as a trade-in program. The recycling program includes free shipping in some states, although in most states you have to pay for shipping.

The BenQ Joybee GP1 offers more than enough to make it a strong contender for business travelers who want extreme portability and for home users who want to project video games at a large size or watch the occasional movie. It's bright, has reasonably good image quality with very little rainbow effect, and includes audio. Moreover, you don't need to a carry a computer or video source to be able to use it—just a USB key.

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