Methods, devices and systems for delivering light therapy to human or non-human animal subjects. Included are shapeable light therapy devices which are formable into different shapes suitable for delivery of therapeutic light to different regions of the subject's body and will retain the desired shape without a need for the use of a strap or other shape-retaining apparatus. Also included are light therapy devices that, in at least some modes of operation, deliver light that is not visible to the human eye and which include indicator(s) to indicate to a user and/or to the subject being treated when non-visible light is actually being emitted.