The full review is available here
English review at BLF
German review at my website
Summary
Seven LEDs in five colors, in a very compact flashlight. The Nichia 519A LEDs are just beautiful with their high CRI and lovely tint. Red, green and blue are less interesting to me, but the UV light comes in very handy. This paired with the great driver and magnetic charging make the MiX-7 almost perfect.
It’s hard to say anything negative about it. I’d like to see more brightness levels for the color channels and maybe the possibility to mix them. Sometimes it can be annoying that the colors were integrated together with the white channel into the low group.
Overall I’m very satisfied with the MiX-7, even at my high expectations I had for this flashlight. If you want a flashlight with multiple colors, you should definitely try the MiX-7.
So you can have a light with a continuously variable wavelength. E.g. to see how organisms/minerals react to any wavelength through photoluminescence.
Basically just academic interest or just for fun.