Wearable light stimulation systems and methods

A light stimulation method comprising:

• positioning a wearable structure carrying light emitters proximate to testes of a patient, where the wearable structure carrying light emitters emits at least one selected wavelength between 400 nm and 850 nm;
• actuating the light emitters in a duty cycle consisting of an ON and OFF sequence wherein ON intervals total at least 5 minutes in at least a 30 minute period;
• and
• providing an irradiance in the range of 20 mW/cm2 to 200 mW/cm2 to the patient's testes where such irradiance enhances testosterone levels in the patient.