Ex vivo penetration of low-level laser light through equine skin and flexor tendons

This study examined the penetration efficiency of laser light (800 nm and 970 nm) through equine cadaver samples with various hair coat colors–unclipped, clipped and shaved. For haired skin, energy penetration was greatest for light-colored hair and least for dark-colored hair. Clipping or shaving improved penetration. For light skin, the 800 nm penetration was better;  with dark skin, the 970 nm penetration was better.