Importance

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Abstract

An apparatus and method for regenerating and retaining hair wherein one or more regions of the scalp of a human head may be selectively and repeatedly exposed to low-level light ('LLL') having a wavelength between about 400 nm and about 1000 nm and delivering an irradiance between about 100 mJ/cm.sup.2 and about 900 mJ/cm.sup.2 over variable exposure times. The LLL is emitted from a light source disposed upon a head covering for covering the scalp of a human head, and is directed toward the scalp when the head covering is worn upon the head. The head covering may be worn alone in one of several embodiments, or it may be disposed within one of several secondary means for covering a human head. The light source is chosen from the group consisting of light-emitting diodes, light-emitting diode arrays, laser diodes, laser diode arrays, and any combination thereof. The light source is operationally connected to means for selecting regions of the scalp to be exposed to LLL, means for selecting LLL wavelengths, means for selecting LLL exposure durations, means for selecting LLL irradiances, and means for selecting the emission of either continuous or pulsed LLL. A photoelectric cell is operationally connected to the head covering to deactivate the light source whenever the head is withdrawn from the head covering.

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First Claim