Epson MG-850HD Projector - Specs

Contrast Ratio is the difference between the whitest white and the darkest black colors the display can show. The greater the contrast, the better the screen and the subtlety of colors it can display.
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Type of technology that is used to project the images.
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A Desktop's form factor describes the physical size and shape of the system. In general, towers and larger form factors offer more space for add-ons and cost less than smaller counterparts.
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Projector brightness is measured in ANSI lumens. ANSI stands for "American National Standards Institute", who created a scale by which to measure the overall brightness value for projectors. The measurement represents the average value of 9 points on the projected screen image. The higher the ANSIv lumens value the brighter and sharper the projected image will be. \r\nWith a measurement of less than 1000 lumens, viewing can be hard unless in a darkened room. With a measurement of more than 3000 lumens, and it may be possible to see even in a sunlight filled room. There are several additional variables to consider as well as lumens, such as lamp bulb type, LCD technology and contrast ratios. If any of these variables is adjusted, it will make two projectors with the same lumens measurement display images of different quality. For example, a projector with a halogen lamp will appear darker than a projector with a metal-halide bulb.
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Platform refers to the type of machine with which a hard drive is compatible.
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LCD projectors create images through a liquid crystal display and are the most modern form of projection equipment. Overhead projectors are older projectors for hard copy transparencies.

DLP, or Digital Light Processing projectors are of the same generation as LCD and offer high quality resolution and brightness.

CRT projectors are older technology and based on three color light projection.
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A video format describes how one device sends a video pictures to another device, or more formally, the video format describes the sequence and structure of frames that create the moving video image. Video formats are commonly known in the domain of commercial broadcast and consumer devices; most notably to date, these are the analog video formats of NTSC, PAL, and SECAM:

NTSC: (National Television Standards Committee), is the analog television system in use in the United States, Canada, Japan, South Korea, the Philippines, Mexico, and some other countries, mostly in the Americas.

PAL: (Phase Alternating Line), is a colour encoding system used in broadcast television systems in large parts of the world (as Europe - except to France and Eastern Europe).

SECAM: (Sequential Color with Memory), is an analog color television system is used in France and Eastern Europe.
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High-Definition is the top of the line, all digital format for broadcasting and viewing TV programming. With HD, you see images at a higher resolution than you have ever viewed on a home screen before. This clarity is delivered in a crystal clear, widescreen format, with CD quality sound: as if a movie theater was dropped in your living room.
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Image ratio refers to the relation of the width of the image to the height. While you can change the size of the image, the ratio stays constant.
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Native resolution refers to the resolution of the computer output signal via the projector. Usually, the input signal (native) from a computer is automatically converted to the projector's own resolution. For this conversion process, the resolution is achieved by hardware/software image manipulation called re-scaling.
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Projectors can create a low hum or background noise from the cooling fan. Here the average noise made by the projector is measured in dB (decibels).
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Some GPS have extra features not normally associated with menus in tracking devices. These can indicate extra information such as weather or temperature readings, altitude or even icon options.
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Depending on the type of use and portability needed, weight is an important consideration when selecting a product.
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Lamp type describes the light source and projection element of a projector.
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As with all bulbs, projector bulbs only last for a certain amount of time.\r\nMeasured in (lit) hours, the life-span can range between hundreds to thousands of hours depending on the technology of the bulb.
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