This gives the user an idea of how much light can be output by the projector. This is describing lumen with respect to candela. The ANSI lumen is already a result of several variables like the contrast and brightness; measuring the white fields at certain multiple spots located on the screen, and also averaging the said measurements which are then multiplied by the measurement of the total screen area.
The resulting ANSI lumen measure is definitely more accurate than plain lumen. However, basing the choice of a projector solely on its highest possible lumen rating may be misleading at some point.
Thus, it is more specific and accurate for determining the brightness of the projector. Cite APA 7 ,. Difference Between Similar Terms and Objects. MLA 8 ,. If anything, the Pico Genie P55 is brighter and also has a better resolution. This is fairly shocking when you consider the Elphas is being listed as 20x brighter than the genuine Pico Genie?
The ANSI Lumen rating should be your core comparison figure, we include both ANSI and 'marketing lumens' on our site to help consumers understand how the true brightness levels are manipulated on other sites like Amazon.
When lumens are used for marekting purposes they tend to be overstated and are also referred to by a number of other different terms including:. For the purposes of helping our customers understand the market better we are displaying 'marketing lumens' as 6 times the ANSI lumens but on some sites the lumen levels can be overstated by as much as 20 times the true ANSI lumens! Brands overstating the lumen counts on their products can negatively effect your shopping experience, how are you to know which brands you can trust?
These values are still lumens, just standardized measures of lumens. Despite being accepted as the industry standard, other brightness measures are often reported for product marketing purposes. Brightness measurements by the ANSI standard are performed as follows. The test projector is permitted to temperature-stabilize for 15 minutes.
Optimal projection dimensions for the device should be used Brightness and contrast are then adjusted iteratively until both conditions are fulfilled. When these conditions are stable, the image is replaced with a full white field and brightness measurements are taken at 9 fixed points in the field using a photometer.
These points form a 3 x 3 checkerboard pattern and are then averaged to express a mean lumen rating for the projection system. The ANSI standard brightness assessment method is subjective and based upon the optical response properties of the human eye. As a subjective measure, it can also be used to calibrate video projection systems for optimal viewing under fixed ambient light conditions. This method also prevents a projector from being overdriven and allows for optimal contrast ratio the projector ratio between its full white and its full black for the best projection image quality.
In the video projection system market, it is literally the wild west, and anything goes regarding product descriptions. Remember, it is all about making the sale, so manufacturers or remarketers will selectively choose different specifications, as well as fail to mention other specifications, to make their product more appealing to buyers.
Since ANSI lumens are an industry standard, all measures reported are standardized by a baseline set of criteria. Despite a difference in their applications, both of these terms are often used interchangeably and have replaced the basis for rating of lighting equipment, which was originally done in watts W , in terms of the electrical power consumed. Skip to content Ever noticed the label of your bulb carefully? ANSI lumen is more accurate than lumen as it takes into account the average value of flux from different positions of the light source with a set of nine experiments.
In contrast to this, the lumen is based on fewer experiments usually involving results recorded from the same position Lumen is used to denote the brightness of LED bulbs, incandescent lamps, and compact fluorescent lamps. On the other hand, ANSI lumen is mainly deployed to specify the light output of projectors. Lumen is the unit of luminous flux under the SI system of units. It is more specific and accurate than lumen since it is based on greater no.
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