Abstract: A light therapy system utilizes an array of light emitting diodes which emit noncoherent light in a narrow bandwidth centered at a designated wave length. The diodes are mounted to project and focus their output on a dermal zone of a patient. A continuous or a pulsed voltage differential is utilized to energize the diodes. Higher voltage differential and peak current flow across the diodes is provided in pulsed operation than in continuous operation. With a designated wave length in the infra red bandwidth, a treatment regimen including a session of 5-10 minutes of continuous operation and a session of 5-10 minutes of pulsed operation once or twice per day has been effective in alleviating various musculoskeletal disorders. A similar treatment regimen utilizing diodes emitting light centered at the red light wave length has proven effective in the treatment of skin ulcers and delayed post operative wound healing.