Low power red diode lasers are proofed to be safe and effective for hair restoration and growth. Low and safe-level power diode laser module are often used as the core part of Laser Therapy for stimulating hair rejuvenation. Tens of laser modules often 5mw red laser diode modules are made into laser hair rejuvenation hand-held gadgets as laser comb, laser helmet and laser band. For better healing effects, more than one hundred red laser modules can be made into a hooded laser housing for a maximum head coverage. This kind of device are often seen in salon spa or Hair Clinic environment.