An optical cavity, such as a laser or transmissive cavity, that can contain an analyte provides a different intensity-energy function with analyte present than when absent. The lighting device includes a housing, a light source provided on the housing for generating a light beam, an inner thermally conductive heat sink, and an outer heat sink member. A separate radio terminal PS3, when receiving the access-restricted transmission allow signal before intended new signal transmission, suspends the new signal transmission until receiving the normal transmission allow signal. Around the polishing portion, an outer peripheral portion having a fixed height is provided.