ANSI and ISO lumens are used to measure the light in the projector system, from which we know how much power the projector lamp has.
The lumens decide the light intensity and how clear the image will reflect on the screen. Projectors with higher lumens will provide brighter and clearer images in higher ambient light conditions.
But Projectors with 3,000 to 4,000 lumens will be sufficient for business and education purposes where we don’t have control over the lights.
But what is the difference between both lumens, and what are the main points one should consider before buying a projector?
What is ANSI lumens & How is light measured?
The American National Standards Institute (ANSI) has established a standardized method of measuring the light output of lamps and light sources in different devices.
To measure the ANSI lumens output of a lamp, a calibrated light meter is placed at a distance of 30 inches (76 cm) from the light source.
This light meter is turned on and adjusts brightness according to a light source.
Afterward, the meter is turned off, and the total ANSI lumen output reading is noted according to brightness.
Remember, the ANSI is measured with “nine different points,” which measure the light output from a projector screen.
This accounts for the fact that light is not evenly distributed from a source, and average light is noted down from these nine points giving accurate ANSI lumen measurement.
What is ISO Lumen & How is it Measured?
The International Organization for Standardization (ISO) has established a standardized method of measuring the light output of lamps and light sources.
This method of ISO is usually used in Japanese projector models such as Epson. Also, for the light source for a projector, they have strict rules to measure the light.
In this method, they place the projector at a distance of 9.8 feet away from the screen to take into account the fact that light is not evenly distributed from a light source.
After taking note of the reading, they multiply it by 4 to get the ISO lumens output on the screen.
ISO lumens VS ANSI lumens
Both methods are used to measure the light output of a projector. The ANSI method is considered more accurate when compared with ISO.
The main reason is that ANSI lumen is measured from 9 points and is strictly used to take account of the entire screen.
Whereas in ISO, only four corner measurements are taken into consideration.
The measurements of both these methods will give you an idea about the projector’s maximum light output. If we talk about a home theater projector, it should have at least 1,500 ANSI lumens.
To put it simply, ISO will give how much light a projector can produce. At the same time, ANSI lumens give you the most accurate lamp power due to all nine fields.
Also, the conversion ratio between both methods is different. 1 ANSI lumen is equivalent to 0.87 ISO lumens. So, a projector with 4000 ANSI lumens will have 3480 ISO lumens.
I hope the article provided you with some valuable insights about ISO and ANSI lumens.
But still, the light will reflect a little bit more in the projector no matter how much the manufacturer has written on it.
The light output of a projector is an important factor to consider before making a purchase. But it is not the only thing that you should keep in mind.
There are other factors like contrast ratio, resolution, and throw ratio, which are also important.
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