| Abstract: | Design, build, and test a wavelength-switchable LED light source unit for delivering red, near infrared, or infrared light (620-1050 nm) that can be used for photobiomodulation or low-level light therapy. When it is used, an appropriate wavelength in the range of 620-1050 nm can be selected by a switch and delivered through a fiber-optic bundle with a tunable power density. The system needs to be stable over 1-2 hours, without significant healing problems. Also, the optical power density is expected to be between 20-200 mW/cm2. |