For reading in the bedroom I use RGB strip behind furniture, preset to yellow. Diffuse light, no blue at all. Of course poor color rendering but I don't mind for this use case.
That is true only for white LEDs. The RGB strip does not have them (there are some that include white LEDs but not this one). If you set it to yellow, only pure red and green elements are on, blue elements are completely off.
There is no such thing as a pure red LED. Those are blue ones but with light
filters. If you don't see blue which is actually present and you see deep red which is actually absent then maybe consider yourself as brainwashed by marketologists.
