I don't know anything about this topic (phototherapy or dual wavelenght LEDs), sorry. What I can suggest is browsing LED manufacturers' websites and viewing datasheets for some of their products, or contacting their sales or technical departments to ask if they manufacture the kind of LEDs that you require.
Do you mean red LEDs and near infra-red? In case you haven't looked into this yet, Electromagnetic spectrum, and Visible Spectrum on Wikipedia could help to understand that if a single LED combining those wavelengths doesn't exist, (and maybe it does, I have no idea, I am of the impression that...) you can combine different LEDs to obtain the wavelengths you require, the same as for horticultural LED use.