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The life span of an arc lamp averages 2000–5000 hours and the replacement cost for these range from $99 – 350, depending on the brand and model. Newer generations' units use LEDs or lasers which effectively eliminate this issue, although replacement LED chips could potentially be required over the extended lifespan of the television set.
The lamp technology of an overhead projector is typically very simple compared to a modern LCD or DLP video projector. Most overheads use an extremely high-power halogen lamp that may consume up to 750 or 1000 watts. [ 3 ]
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
Overhead projector and slide projector: Video projector: Primarily for continued use of older materials. Some teachers find the overhead projector more convenient for lectures depending on their teaching style. Phonograph and phonograph record: Audio cassette, 8 track tape, CD, digital audio: Used to play older or archived recordings.
The system replaces the xenon arc lamp of a traditional digital projector with a laser light source, and is capable of 60 fps with "50 percent greater" brightness than the Digital Cinema Initiatives spec, a contrast ratio "double" that of IMAX 15/70 mm film projection and "higher" than the 2,500:1 contrast ratio of IMAX's xenon lamp-based ...
It is a modern equivalent of the slide projector or overhead projector. To display images, LCD (liquid-crystal display) projectors typically send light from a metal-halide lamp through a prism or series of dichroic filters that separates light to three polysilicon panels – one each for the red, green and blue components of the video signal ...