Originally Posted by SOKO
Why would i want a "home theater" projector with 800 Lumens vs a 2000 Lumens data projector for the same price.
Because a "so-called" 2000 lumen projector is designed to show power-point presentations in brightly lit hotel conference rooms. There is usually no big effort made to produce accurate colours or proper grayscale tracking. They are generally optimized for computer screen formats and tend to use slow colour wheels which can result in "rainbow effect". They often have white segments in the colour wheel to exaggerate the contrast ratio and usually do not have HDCP compatible digital inputs.
An HT projector is designed to show movies and give you accurate colours and proper gray scale, accept HDCP encrypted signals from DVD players and cable/satellite boxes, eliminate RBE and generally provide a considerably superior picture quality in wide-screen, movie/TV formats.
The lumen values found on HT projectors are appropriate for industry standard target brightness in light-controlled environment. The SMPTE standard brightness is 12-16fL.
A typical calibrated brightness
of 600 lumens (as is found on the popular InFocus SP4805 at low power
) will produce 24fL on a typical 92" image on a standard white wall (with 1.0 gain). Most AVSers who own the SP4805 actually put a neutral density filter on the 4805 to cut its brightness in half
to 12fL. The when the lamp ages and dims, they remove the filter to make it brighter again. (You can get exactly the same results on a 106" image with an 800 "calibrated lumen" projector.)
In the same setup, a "so-called" 2000 lumen business projector will produce 80fL of brightness - FIVE TIMES
too bright! In a theatre environment, watching movies for a few hours, the viewer will develop headaches and eyestrain. The reflected light from the screen will illuminate the room, destroying black levels in the image. Sunglasses would be appropriate!
Even the 200 lumen output you scoff at will produce a standard brightness 92" image if you use a screen with a gain of 1.5
The answer to your question, in short, is that the HT projector will give you a superior movie experience in a home theatre!