I have seen studies that find effects for a range of different wavelengths, including green and all the various orange reds you mention, plus infrareds.
imo
Reporters mistakenly think that the specific wavelength used in a particular study, such as 670nm, is uniquely special for mitochondria of the eyes.
I dont think any single specific wavelength is required, to obtain the benefits of light therapy.
imo, if we were to use sunlight, the same way other colored lights have been used and studied, we would see similar benefits. I think our modern lifestyle deprives us of essential natural light energy, and as a result we now produce devices to supplement that defficiency.
The Red Light Device Mini you mentioned (thanks for the links) is more powerful and expensive, and is used at 80cm distance, so it can illuminate a larger surface area than the small, inexpensive flashlights I use for spot treatments.
It would be useful for me to learn how to compare the lighting power that is being applied to the skin surface, from various light therapy devices.