The luminosity is measured in ANSI lumens. For the home projector, the luminosity has to be at least around 700 ANSI lumens.
The place where the pr...
The luminosity is measured in ANSI lumens. For the home projector, the luminosity has to be at least around 700 ANSI lumens.
The place where the projector is installed has a very important role in choosing the right video equipment. For the rooms with controlled artificial light and no natural light there is no need for a projector with a very white light, which is necessary in the rooms with many windows and a lot of natural light sources.
For the small rooms a 700 ANSI lumens are sufficient ,in the slightly light rooms are recommended 100 ANSI lumens and for the places with strong light the ideal projector is one with 2000 ANSI lumens.
In some cases, the luminosity calculated by the producers was created after the computer signal which is stronger than the video signal.
The two major factors that need to be considered when we are talking about the image quality are the image uniformity and the resolution. The resolution represents the number of pixels which create the image. The most common resolutions are SVGA and XGA. A projector with XGA resolution has an almost doubled pixels number than a SVGA but also costs a lot more.
For a better quality of the image there is need for something more than just resolution. The uniformity of resolution is also important. This represents the percentage between the luminosity from the center of the image and the one at the edges. A larger percentage results in image continuity. To achieve this, the percentage needs to be at minimum 85 %.
The connectivity and compatibility are factors which influence the contrast and the clarity of the image. The recommended projectors to become home cinemas usually have many entrances, special micro chips and other options. Other projectors without being created for the home cinema features are offering a high quality image.
The first ARC lamps were developed in’09 by Sir Humphrey Davy. These lamps were carbonic arch lamps functioning with one carbon baguettes fixed at each of the two polls of a battery and creating through their touch a white incandescent light. If these baguettes were separated and put at a distance of 10 cm they would create a luminous strong white light arch. These principal is what stays at the base of the projector lamps present nowadays.
The ARC lamps used in video projectors have a limited functionality period. The life span of an ARC lamp refers to the exact period during which the intensity of the lamps luminosity decreases by half from the initial value and quality. This feature is estimated in hour value and comes with an estimated functioning period somewhere between 1.000 and 4.000 hours.
A high quality lamp will have larger life duration and of course will decrease the maintenance expenses for the owner of the video-projector. It is also very important to keep in mind that after the estimated time for the lamp functioning has past it is not exactly mandatory for the lamp to malfunction immediately. The lamp functioning can go on but the quality of the displayed images will decrease gradually until the replacement of the lamp will become imminent.
It is good to know that the lamps life estimation in hours, defines in fact the half time from the lamps life, meaning that when the maximum of the estimated period of lamp functioning is reached the power of the lamp is at its half potential reported to the quality of its performance in the beginning. If the video projector is used instead of a TV, for movie display, the cost of lamps replacement must be considered when the video projector is purchased.
If you use the projector to see only movies and special events, the life span of the lamp is not so relevant but still needs to be considered. The average use of such a projector is somewhere around 8-12 hours a week and the lamp has a larger life span reported in time.
