ANSI lumens and ISO lumens are widely used to label the brightness of projectors. This post will explain and compare the two brightness units in detail.

1. ISO lumens

ISO is short for the International Organization for standardization. ISO lumens are regulated by ISO, which is also an internationally recognized unit. The ISO lumens have strict measurement methods and standards under the ISO 21118 regulation.

The calculation of ISO lumens is strict in terms of measured image size and distance.  ISO lumens are used by Epson projectors to label their products.

2. ANSI lumens

The full name of ANSI is American National Standards Institute.  ANSI lumens are the results that are measured by the 9-point test. ANSI lumens have relatively loose measurement requirements compared with ISO lumen, usually specifying only the size of the image to be measured, and selectively ignoring the projection distance of the projector and possible loss during projection. 

ANSI lumens are widely used by most projector producers, which can be seen as the standard brightness unit in the market.

ANSI lumen vs ISO lumen

3. ISO lumens vs ANSI lumens

Both ISO lumens and ANSI lumens are internationally recognized brightness units used in the projector industry.

Provided the brightness of a projector is fixed, the figure of ANSI lumen is much bigger than ISO lumen. The conversion ratio between ANSI lumen and ISO lumen (ISO21118) is 1:0. 8. That is to say, 1 ANSI lumen = 0.8 ISO lumens.

ISO lumens vs ANSI lumens

4. Conclusion

It is worthy to note that lumens without a particular unit explanation may be light source lumens, which have no unified measurement standard. Generally, the light source lumen figure is amazingly higher than its real ANSI lumens or ISO lumens.

You can use the ANSI to lumens converter to convert more lumens units.

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