www.aahlight.com/red-light-therapy
www.bioptron.com/products/bioptron-2.aspx
www.bupa.co.uk/health-information/directory/l/light-therapy
www.collegeofsyntonicoptometry.com
www.energyandvibration.com/light.htm
www.inlightwellness.com/light-therapy
www.int.aesthetic.lutronic.com/intl/professionals/treatments/light-therapy/
www.international-light-association.org