Brightness is usually measured in ANSI lumens as a unit of projected brightness. Lumens is a measure of "light flux" developed by the American National Standards Institute. It refers to the indicator of the intensity of light emitted by the projector. Therefore, many consumers think that lumens represent the nominal brightness of the projector.
In fact, lumens indicate the amount of light projected onto the projection screen, or the ability of the visual response of the projection source to radiate per unit time. ANSI proposes a unified standard for projection "lumen". Under the conditions of projection resolution, field frequency, color temperature, contrast and other parameters, the illuminance at each intersection of the "field" in the projection screen is tested, and then multiplied. The projected area is calculated as the average value at each intersection, which is the lumen size of the projector.
In theory, the larger the lumen value, the higher the brightness of the projector and the clearer the projected image. From a practical point of view, in a well-lit environment, the projector with high brightness is better than the low-brightness projection. However, this does not mean that the higher the brightness, the clearer the projected picture.
In the actual projection process, the brightness of the projector is also related to some objective factors. For example, under certain conditions such as projection resolution, field frequency, color temperature, contrast, etc., the clarity of the projected image is not only related to the power of the projector bulb, but also directly related to the area of ​​the projection screen and the projection distance. Relationship.
As a technical indicator closely related to the projector, consumers usually ask such questions when purchasing projections: "How much brightness should our projectors in our homes?" That is, when you choose a home theater projector, It will inevitably fall into the confusion of brightness selection. Like projection products in other application industries, home theater projectors are expressed in ANSI lumens, and their brightness is typically in the range of 800-1500 lumens. Perhaps many consumers should ask questions, why can't the brightness of home projectors be higher?
Simply put, the reason is that home theater projectors don't need too much brightness, especially for small, professional home theaters. Many manufacturers focus on the video quality and image details of home theaters. The 720p and 1080p home theater-level projections from Sony, Mitsubishi, Samsung and many other manufacturers have a contrast ratio of more than 10,000:1. Projectors with dynamic contrast tend to be more expensive. For projectors with too high brightness, the dynamic contrast ratio will be lower, because the light color will be more clear in the dark, especially in the case of lights, the pure black and bright colors will be damaged, lowering. The effect of home theater. Welcome to Home Theater Network
In addition, it is also necessary to point out that the classification of lumens is different for all types of projection manufacturers. Commercial projectors are typically categorized in data mode, while home theater projectors are categorized by video speed. Since the lumen output of the video is different from the data, the brightness of the home projector will generally appear to be lower than that of the commercial model.
Therefore, we can't look at the home theater-level projections by looking at the general business and educational projections. Originally, their application fields are separated by mountains.
On the other hand, we also need to choose different brightness indicators according to the different space environment. In general, the home theater projector application environment can be divided into two categories: a professional home theater environment with controllable lighting and a daily bedroom that has been modified.
First, for the daily living bedroom, we certainly hope to easily convert it into a home theater full of sweet atmosphere.
Home projection is of course essential. This kind of cinema environment is originally our ordinary bedroom, its brightness can not be controlled freely, and the projector will also be affected by the brightness of the wall screen during the screening. Therefore, when we purchase a home projection for the living bedroom, the brightness index should be locked at 1000 or more than 1000 lumens.
Second, in the professional screening environment, the indoor lighting is completely controllable. When the home projector is working, the requirements for the brightness of the projection environment will of course be lower. And when users watch movies and TV shows, they don't have to pursue high brightness, but they are better off. Therefore, the brightness standard at this time is selected at 800 lumens, and the image detail display at this time is also very clear.
Moreover, when viewing HD projection, the projection screen is also an extremely important part. Unlike traditional CRT TVs, we certainly have more requirements when using a projector to build a home theater, which means we need to purchase a more suitable projection screen.
From a technical point of view, it is not difficult to understand from an optical point of view. No matter what image the projector projects, it is formed by the light reflected from the projection screen to the human eye. Since the screen of the projection screen is a light-receiving surface, it is passive from a physical point of view. Therefore, different screen materials and viewing angles have different reflection intensity, spectrum and transmission modes, so that the image that reaches our eyes is also There are differences. Especially for the requirements of home theater, the image is not only clear, but also has high requirements in terms of brightness, contrast, color, detail, noise and so on.
Closely related to the brightness, the user also has to learn to select the projection screen according to the predetermined projection, or to select the appropriate brightness of the home projector according to the locked projection screen. In general, the larger the projection screen, the higher the brightness required by the projector. Welcome to Home Theater Network
Here, the author gives a simple correspondence between the projection brightness and the screen size:
Screens up to 100 inches: 800 lumens;
100-120 inch screen: 1000 lumens;
Screens above 120 inches: 1300 lumens or more.
Of course, some people will say that our home projections are not necessarily limited to the home theater environment, and sometimes used in corporate presentations and other environments. Therefore, we can also see that there are also higher brightness products in home theater projectors. These products are also generally considered to be multi-purpose machines, which are the entertainment projectors we often hear, like the BenQ MP510 that was famous in the past. Their prices are usually very low and are also popular with many home users.
Everything has its two sides. These entertainment home projections are mostly 4:3 aspect ratio models. They also lack some of the home theaters to provide FullHD resolution. More importantly, the video input of these entertainment projections will be lower, and some fans will have louder noise, which is the focus of our home projection users.
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