An operatory lamp used to illuminate a treatment area for treating a dental or medical patient, with the lamp being adapted to be movably mounted at a predetermined position above the treatment area to facilitate a doctor in treating the patient, the lamp comprising: a housing having a front portion toward the treatment area and a rear portion away from the treatment area; the front portion of the housing including an elongate support member extending to a generally central axis of the housing, an LED light source mounted on the support member generally at the central axis of the housing for generating light in a plurality of visible wavelengths and projecting rearward away from the treatment area, with the LED light source having a base toward the treatment area and a lens away from the treatment area; a reflector at the rear portion of the housing being illuminated by light from the LED light source and reflecting the light past the support member generally parallel to the central axis of the housing toward the treatment area for illuminating the treatment area, characterized in that the lamp also comprises: an optical filter for eliminating undesired visible wavelengths from the light emanating from the lamp and prior to illuminating the treatment area, wherein the optical filter comprises a filter member positioned between the light source and the reflector transmitting and filtering the light generated at the light source and directed toward the reflector and wherein the filter member comprises a semiconductor panel with areas that can be selectively rendered opaque to light of a selected visible wavelength. a housing having a front portion toward the treatment area and a rear portion away from the treatment area; the front portion of the housing including an elongate support member extending to a generally central axis of the housing, an LED light source mounted on the support member generally at the central axis of the housing for generating light in a plurality of visible wavelengths and projecting rearward away from the treatment area, with the LED light source having a base toward the treatment area and a lens away from the treatment area; a reflector at the rear portion of the housing being illuminated by light from the LED light source and reflecting the light past the support member generally parallel to the central axis of the housing toward the treatment area for illuminating the treatment area, characterized in that the lamp also comprises: an optical filter for eliminating undesired visible wavelengths from the light emanating from the lamp and prior to illuminating the treatment area, wherein the optical filter comprises a filter member positioned between the light source and the reflector transmitting and filtering the light generated at the light source and directed toward the reflector and wherein the filter member comprises a semiconductor panel with areas that can be selectively rendered opaque to light of a selected visible wavelength. an optical filter for eliminating undesired visible wavelengths from the light emanating from the lamp and prior to illuminating the treatment area, wherein the optical filter comprises a filter member positioned between the light source and the reflector transmitting and filtering the light generated at the light source and directed toward the reflector and wherein the filter member comprises a semiconductor panel with areas that can be selectively rendered opaque to light of a selected visible wavelength.