Please add : Blue Light Hazard Flux on the f.luxometer



  • You have Melanopic Flux - thanks
    What's missing and most important topic is Blue Light Hazard Flux, integrated over the Hazard Factor range as per ANSI, IEC and TUV methods. You already have it on your site - why not put it in the meter ?

    Is it because f.lux software would still have a high blue-hazard reading ?



  • Hi David - yes we have a long list of things to add to the client software. I regard the current efforts in the display industry as largely nonsense not founded in good science, and I will try to clarify why.

    The main reason is that "ratio" is not a risk - instead, "dose" (total photons absorbed) is how risk is measured.

    If you are concerned about hazard standards, you need a meter that can respond to extremely high light levels (usually as a spot meter), and currently the meters we recommend cannot do this. So for our research partners who are actually measuring hazard levels, we do not want to misrepresent our capabilities.

    But what we are talking about here is the idea from people in the displays industry that levels 50x lower than the international standards may pose a risk, and simply put: there is no documented hazard at normal display radiance levels.

    We can compute a hazard factor at lower light levels, but we do not think the TUV/etc. focus on this single number is appropriate, because it ignores overall radiance level. The retina is known to respond to total photons absorbed, not to a ratio, so without a measurement that corresponds to actual ICNIRP dose levels, we should not endorse a metric like this.

    As for your worry that f.lux is not adequate: f.lux by default reduces the hazard factor by more than 90% (exceeding the levels of 10-20% that are being used in the market), so I would not worry about us in that regard. If there is a problem in these ranges, we are doing something to help, and I would submit that reducing this light by 10-20% does not do very much at all.


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