A method is disclosed of providing photo-chrono-therapy to a wound site in a human or animal subject, the method including: determining or receiving subject circadian and/or ultradian cycle information indicative of a biological rhythm(s) of the subject and based on the subject cycle information, delivering a photo-chrono-dose of infrared treatment light to the wound site with wavelengths within at least one infrared wavelength range and having a dosimetry configured to promote healing at the wound site.
