Another important feature is color temperature settings such as cool, medium and warm which compensate for the amount of light is the room. FPTV Front Projection Television FPTVs are the biggest you can get and are limited to about 20 feet. CRTs are more expensive but tend to produce better and brighter pictures. CRTs also need to be readjusted every six months to two years. LCD front projectors do not need any readjusting after they are installed and only a simple bulb change every now and then, but cannot produce the true blacks of a CRT type projector.
Some projectors have a built-in tuner.
If it does not have one, you will have to use the VCR to control television channels. First, video grade scans at 15.75kHz. These are the least expensive CRT models. Graphics grade are the best and can scan at 63kHz and higher and can be used with a line doubler or a line quadrupler. The amount of pixels is what determines the quality of a LCD projector with the higher the better.