Just to add to the other great response, the “D2” pictured above is configured with one ultraviolet emitter and one “deep” red emitter which is not an easy combination to find. And there is a wide range of emitters to choose from based on preference.
If you’re willing to try Aliexpress, Convoy offers a cheap twistable AAA light with a basic low CRI emitter in three color temps for under $10. It’s better than other twist lights I’ve used like because both “on” and “off” are tightly secured to the body so the light won’t fall apart or turn itself on.