At home Red Light Therapy, does it actually work?

If the at home red light therapy has the same specs, power, wavelength (630ish nm), voltage, etc, meaning it is seemingly the same thing as an in office light, A) will it have the same effect and B) do these actually work for promoting collagen growth? How far beneath the skin do they get? If one can get results from doing this therapy at home, are there any brands any doctors would recommend or any specifications that are critical to attaining results (light color, wavelength, voltage, etc)?