SLD/LED cluster probe with 950 nm SLDs and 660 nm LEDs; Light therapy technology uses infrared energy to provide patients with a temporary increase in blood circulation, temporary relief of minor muscle and joint aches, pains and stiffness, relaxation of muscles and temporary relief of minor pain and stiffness associated with arthritis. Wavelengths between 660 and 1,000 nm are used for this purpose. Light emitted by the laser diode penetrates deepest followed by the superluminous diode (SLDs) and then the light emitting diode (LEDs).