Disclosed are examples of spectrometer-equipped devices that provide general illumination supplied by artificial or natural light, and that also detect substances in the environment around the device. In some examples, light may be emitted by a spectrometer light source. The spectrometer detects the light from any of a natural light source, artificial general illumination light or light from the spectrometer light source passed, reflected or shifted and regenerated by substances in the air or on a surface in the vicinity of the device. In response, the spectrometer generates signals representative of the spectral power distribution (e.g. intensities of given wavelengths in the optical spectrum) of the detected light. A controller analyzes the spectrometer generated signals and initiates action based on or outputs a report indicating the environmental condition detected by the spectrometer-equipped device.