A Video Projection system takes a video signal and projects the corresponding image on a projection screen using a lens system. Video Projection systems are widely used for conference room presentations, classroom training, home theatre and live event applications. Projectors are widely used in many schools and other educational settings.

Audio, Lighting and Video systems are key elements of an AV system design. To get the best result, a lot of concerns will need to be taken, from the type of source (HD source, SD source), projector (DLP, LCD type), screen (tensioned, non-tensioned, perforated etc.) 

The cost of a device is not only determined by its resolution, but also by its light output, acoustic noise output, contrast, and other characteristics. While most modern projectors provide sufficient light for a small screen at night or under controlled lighting such as in a basement with no windows, a projector with a higher light output (measured in lumens, abbreviated “lm”) is required for a larger screen or a room with a higher amount of ambient light. A rating of 1500 to 2500 ANSI lumens or lower is suitable for smaller screens with controlled lighting or low ambient light. Between 2500 and 4000 lm is suitable for medium-sized screens with some ambient light or dimmed light. Over 4000 lm is appropriate for very large screens in a large room with no lighting control (for example, a conference room).

Projected image size is important; because the total amount of light does not change, as size increases, brightness decreases. Image sizes are typically measured in linear terms, diagonally, obscuring the fact that larger images require much more light (proportional to the image area, not just the length of a side). Increasing the diagonal measure of the image by 25% reduces the image brightness by 35%; an increase of 41% reduces brightness by half.

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