Carnation Hair Growth Laser Equipment Improve hair growth anti hair loss laser hair growth equipment Red Light Hair Therapy (RLHT) is a non-surgical, scientific approach in the cosmetictreatment of hair loss, thinning hair, and scalp problems. RLHT has been tested for effectiveness and safety for over 30 years all around the world. The RLHT non-surgical cosmetic treatments utilize a solid state semiconductortherapeutic LED panel. RLHT functions on the same scientific principle, as that of photo-bio-stimulation; narrow band red light (630-670nM) stimulates cell metabolism and helps damaged cells to repair themselves.