Hi,

I think my only problem with LEDs (and other light sources) is the high ratio of dark blue (440nm) to cyan (495nm). Good blue filter glasses work to some extent, but now I am looking for a new approach:
My theoretical wish would be glasses which convert 440nm to 495nm by fluorescence, but I am not sure if this is possible (I do not know such a phosphor).
But theoretical wish aside, what surely is possible is a cyan (495nm) narrowband light source.
I would prefer it as a light with a USB connector and flexible throat and one with a E27 bulb socket. I didn't find this, so I made up some DIY solutions:

Approaches I came up with are:
1) Buy a halogen lamp and cyan narrowband color filter film
-Very energy intensive
-heat problems
2) Buy a narrowband cyan LED:
-I only find expensive LEDs for self-soldering
3) Buy phosphor powder:
-You should have specific activation light and no clue how to make it to glass
4) fluorescent glass:
-Didn't find one with good emission spectrum to buy
-The glass of LEDs only converts to broadband green

I am writing here mainly to make sure I didn't overlook a good cyan (495nm) narrowband light, so in case I overlooked you can point me to.
But you can also comment my approaches.

    Hanzebenger Why do you think that your problem is the high ratio of dark blue (440nm) to cyan (495nm)?

    Having high 440nm and low 495nm? Is that it? With what basis do you say that? Any science, theory? Have you made experiments with your eyes?

    And how good blue glasses filter work? Do they eliminate the pain? Or just alleviate?

        tfouto blue filter glasses alleviate, but I haven't had a 100% dark blue blocking glasses yet. It's difficult since I don't want cyan to be blocked.
        I compared spectrums of CCFL monitors and LED monitors and found the missing 495nm with LED monitors as key difference.
        Some scientific stuff: http://lucasgroup.lab.manchester.ac.uk/measuringmelanopicilluminance/
        I believe that 495nm activates defense against 440nm.
        It's only a theory until now, I will write a blog or something when I am sure.

            Hanzebenger There are other differences.

            https://pcmonitors.info/wp-content/uploads/2013/01/CCFL-spectrum.png

            One of them is that green is by far the most strong component of the spectrum, and the blue is much less strong than the LED's. So if the the blue light is harmfull, the CCFL is much softer on the eyes.

            About the green light being stronger on CCFL, matches our color light senstivity:

            https://www.physicsclassroom.com/Class/light/u12l2b2.gif

            We are way more sensitive to green, and on LED the green component is weak, and the blue is really strong, and the S-Cones (Blue) are the less sensitive.

            Also there are dynamics about the pupil and pRGC cells they are more sensitive on the 480 nm. That wavelenght is almost non-existent on new LED's

            https://www.ncbi.nlm.nih.gov/core/lw/2.0/html/tileshop_pmc/tileshop_pmc_inline.html?title=Click%20on%20image%20to%20zoom&p=PMC3&id=2151130_gr4.jpg
            https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2151130/

            I will dig into the study you shared. Thanks

              i wonder how many of us test for red-green colorblindness. i do. the blue ishihara tests are crystal clear for me compared to the other colors, so perhaps i'm ultrasensitive to blue

              dev