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    where to buy blue light meter online?

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    • Tungsten_smoothT
      Tungsten_smooth @radiology_dr
      last edited by

      @radiology_dr I have an idea--you can use a blue shirt, and how blue it looks (versus more green or even greyish) is how much blue there is an a light source.

      1 Reply Last reply Reply Quote 0
      • R
        rsoler
        last edited by

        This is a neat idea, however there's are a TON of different ways to make an object appear blue. Rather, you can buy technical filters if you want to focus on a specific wavelength of light.

        https://www.rosco.com/filters/roscolux.cfm

        You can buy a sheet of each color for less than $10 through barbizon.

        Then you can apply this filter over a standard light meter and measure away. Be sure to also capture the photopic lux as well. You want to make sure you're measuring blue content per lumen (Visible light).

        1 Reply Last reply Reply Quote 1
        • herfH
          herf
          last edited by

          The cheapest way I know is:

          1. Buy some blue "pool cue chalk"
          2. Put your blue chalk and white chalk in a box you can carry around
          3. Take a picture of it when you want to measure something

          Do this for daylight to calibrate your chalk (you'll need an imaging app that lets you get linear pixel values, like Photoshop in 32-bit mode).

          Then, to test another source, do this again, and get a ratio.

          We measured some chalk with a spectrometer and its reflectance spectrum peaks at 470nm.

          70 cents for a blue light meter!

          lornaL 1 Reply Last reply Reply Quote 0
          • lornaL
            lorna @herf
            last edited by lorna

            @herf It helps to rub the chalk on a rough surface like concrete or sandpaper the first time to smooth it out!

            @lorna

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            • X
              Xiubaolin
              last edited by

              Hi, I am also interested to buy a blue light device in order to measure the blue light harzard. Do you know some devices which can measure it ?

              Thank you :)

              1 Reply Last reply Reply Quote 0
              • L
                LED-Profi
                last edited by

                Hello,
                actually there are spectrometers on the market for around 1200 Euro. With this you can measure the spectrum and depending on the app function you can calculate the different lux values according photopic, scoptic or also melanopic to analyze the blue light.
                I did some measurement at a Samsung galaxy S8+. The testreport with all further interesting links you can find here at the link underneath. It is written in German, but with some nice table and pictures. it will be easily to understand.
                Have fun reading it. There is also the link to the equipment, which I used, available.
                https://www.ledclusive.de/blog/melanopische-lux-am-beispiel-blau-filter-eines-smartphones-gemessen/

                T 1 Reply Last reply Reply Quote 0
                • herfH
                  herf
                  last edited by

                  Also take a look here:

                  https://fluxometer.com/page/measure/

                  1 Reply Last reply Reply Quote 0
                  • T
                    tfouto @LED-Profi
                    last edited by

                    This post is deleted!
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                    • S
                      smithclarkson01 @Tungsten_smooth
                      last edited by

                      fluxometer and spectrometers are same ? :/ cofused.

                      https://9appsapk.vin/ https://vidmateapp.vin/ https://vlc.vin

                      herfH 1 Reply Last reply Reply Quote 0
                      • herfH
                        herf @smithclarkson01
                        last edited by

                        @smithclarkson01 fluxometer is our measurement brand.

                        You can use several spectrometers with our software. https://fluxometer.com/page/measure/ is one example.

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