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How can I compare light doses between different devices?

April 26, 2017compare Devices different doses light

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How can I compare light doses between different devices?

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Each device manufacturer publishes the intensity of their device (usually in lux) as measured at the recommended distance from your eyes.So the lux from a portable device that is 1-2 inches from your eyes is comparable to the lux of a desk-top device that is 18 inches from your eyes, etc.