We did a side-by-side comparison of two projectors, one claiming their brightness at 6,500 LUX and the other claiming 6,500 ANSI Lumens and the outcome was clear (pun intended). There is no officially recognized standard for what some in the industry call LED Lumens. Both White Brightness and Color Brightness are measured in Lumens. There are two internationally recognized standards for Projector Brightness - ISO 21118 and IDMS 15.4. LED Lumens - There is no such thing as ‘LED Lumens’. ![]() The two internationally recognized standards for Projector’s White Brightness and Projector’s Color Brightness both require 9-point measurements of the entire screen not the light source. White Brightness or Color Brightness of the projector has to be measured at the screen as defined by the scientifically approved standards. Light Source Lumens – There is no standard that reports Light Source measurement of a projector. Lumens is equal to the LUX measurement times the screen area in square meters. Projector LUX measures the amount of light falling on the screen. LUX and Lumens are related but are critically different. LUX – There is no standard that reports the Lux measurement of a projector. Here are some of terms incorrectly used by some projector manufacturers and why they are not giving customers the full picture (literally): Name ISO 21118 defines the measurement and reporting of White Brightness and IDMS 15.4 defines the measurement of Color Brightness. Lumens are independent of light source or projection technology, so it applies to all projectors. The international standard for measuring Projector Brightness is Lumens. Projector Brightness is one of the top considerations for projector buyers. ![]() So, what is the difference between LUX and Lumens? To read more about this agreement, click here. The agreement is a result of Epson’s proactive campaign to highlight deceiving advertising that does not use industry standard specifications. Epson is focusing this suit on how these four brands do not use the industry-standard specifications and can potentially be deceptive in their claims, specifically the quoting of “LUX” instead of lumens on projectors.Īlso, just recently (March 2021), Epson America announced it has reached an agreement with Philips and Screeneo Innovation that all future Philips NeoPix projectors designed, manufactured, and sold by Screeneo will use industry standard specifications (ISO 21118:2020) for brightness claims. As you may have seen in my recent news article, Epson America filed a lawsuit in late November against four projector brands sold on Amazon - Vankyo, WiMiUS, GooDee, and Bomaker.
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