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LED PBM Helmet. LED PBM helmet containing 256 individual LED lights delivering near-infrared (810 nm) wavelength with a power of 60 mW per LED light, for a total power of 15 W, an irradiance of 24 mW/cm2, energy of 72 Joules, and a fluence of 28.8 J/cm2 was applied to the whole brain for 20 min, while traditional speech-language therapy was provided. LED, light-emitting diode; PBM, photobiomodulation.
