They have a relatively complicated setup, but front-projection systems provide the largest image possible among HDTV options.

Similar to a movie theater setup, front-projection TVs employ a screen and a projector, each sold separately. The screens can range from 70 to 200 inches (measured diagonally).

HD projectors start at $1,000 (expect to pay more for 1080p projectors); a good screen will run several hundred dollars.

There are many types of HD front-projector units. They utilize the same technologies as rear-projection HDTV.

DLP and LCoS systems bounce light off a microchip, through the lens and onto the screen, and LCD systems project light through the microchip and onto the screen.

An advantage of a front-projection system is that you can resize the image at any time by simply moving the projector closer to or farther away from the screen. Also, these setups are highly portable.

Screens can be rolled up and projectors unplugged and moved whenever you want to relocate your HDTV.

Front-projected images are highly susceptible to light wash-out, so they require a dark room for you to fully appreciate the high-definition picture. Also, setup and installation of front-projection systems can be complicated when connecting speakers, a DVD player, and the tuner with the projector (which receives these connections) mounted on the ceiling.

The bulbs used in HD projectors last about 2,000 to 3,000 hours and cost approximately $350 each. There is also a risk of "rainbow effect," as there is with rear-projection televisions (see Rear-Projection HDTV).

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