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
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.