Technology & Learning - May 2008 - (Page 40)

By Jeffrey Branzburg The Big Picture There are a variety of factors to consider when finding the perfect projector. Pick your priorities. match the resolution of your laptop or computer to that of the projector. Typically, a projector will have a “native resolution” as well as “supported resolutions.” The native resolution is that at which display will be optimal; supported resolutions are achieved by scaling the image, resulting in a loss of quality—a similar effect to enlarging a small digital photo to a larger size. A projector connected to your computer gives you the ability to share your Here are features to consider when choosing a projector, whether it’s a liquid crystal display or digital light processing model. screen with a classroom. You can display Web sites, show students’ computerized presentations, provide large-group modeling of skills and techniques, brainstorm concept maps, play a video, or mark up the screen and save your notes. Brightness A projector’s brightness is measured in lumens. The least expensive projectors are usually the lowest in lumens (fewer than 1,000) and are designed for small rooms with the lights lowered. In general, more than 3,000 lumens are needed for auditoriums and other similarly large rooms, under normal light conditions. Size and weight If your projector will stay in one room or be mounted, size and weight become less of an issue. However, if it will be carried then you may want to consider smaller, lighter projectors. Small projectors may be as light as 1 or 2 pounds, many are about 5 to 7 pounds, and some weigh considerably more. Smaller, lighter projectors can cost more or may not be as bright or have as high a resolution. Larger, heavier projectors may have additional features such as multiple inputs and outputs. Lamp life Projector lamps can be expensive, with some costing as much as hundreds of dollars, making lamp life an important consideration. A life of 2,000 hours is considered to be good. Certain projectors offer an economy or whisper mode (diminished brightness, lower fan noise). Also, remember to let the projector’s fan stay on for several minutes after turning off the light so the lamp can cool down. Inputs and outputs In addition to the standard computer connection, projectors may also have Resolution Depending on the type of information you are projecting, different resolutions may be appropriate. For example, most PowerPoint presentations, as well as simple For projector charts and graphs, project options, see well at 800x600; highpages 42–44. resolution graphics and small print may need as much as 1280x1024. Available projector resolution choices include VGA (480x640), SVGA (800x600), XGA (1024x768), and SXGA (1280x 1024). And remember—it is best to 40 | www.techlearning.com http://www.techlearning.com

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Technology & Learning - May 2008

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