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Projectors are used in various places, including offices, art displays, and homes because they are able to display on a large screen at a lower cost than standard displays.
Many models are available on the market, but one of the most essential factors in selecting a projector is the "brightness" that the projector can project.
Brightness is an important factor that directly affects the ease of viewing and the beauty of the images. Even if the specs are the same, the brightness may be completely different when you see the projected image.
Why does this happen? This is because manufacturers sometimes use different standards or unique measurement methods.
Since the concept of the brightness standard differs, the higher number on the specs does not always mean it is brighter, making a correct comparison impossible.
This page explains the international standards for brightness, which can be used to select a projector.
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The Japan Business Machine and Information System Industries Association（JBMIA）is an organization that contributes to developing the business machine and related information system industries.
JBMIA conducts projector-related standards review activities in various countries worldwide and promotes and publicizes these standards.
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The unit for projector brightness is "lumens (lm)."
On the other hand, lumens are also a unit of physical brightness, and sometimes the brightness specifications of products are measured differently from international standards.
In such cases, the value may be significantly higher than the brightness based on international standards, such that it cannot be compared, so please be careful.
| Indicator |
International Standard Name |
Details |
| Lumens |
"ISO/IEC 21118 (Japanese Standard: JIS X6911)" |
"Brightness is calculated by dividing the screen into nine sections and using the brightness of each section. This is the most reliable brightness. |
Measurement Method
Lumens, which indicate a projector's brightness, are calculated by multiplying the average of the illuminance lux at the nine center points of each of the nine segments of the projection screen by the projection area.
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The following are the measurements made by each company according to their own standards, distinct from international standards, and are unsuitable for comparing projectors.
On the other hand, lumens are also a unit of physical brightness, and the brightness of measurements that differ from the international standards may be shown as a product's brightness specification.
Examples: LED lumens, Laser lumens, Light Source lumens, ISO lumens, Lux (Lx)
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As shown above, the brightness of projectors varies greatly depending on the measurement standards.
In addition to the above examples, each country has standards and specifications defining measurement methods.
To avoid selecting the wrong projector, we recommend checking the manufacturer's website to see if the brightness is shown based on international standards.
Example: ISO/IEC 21118:2020 compliant, JIS X 6911:2021 compliant
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