flea collar or similar insect control collar or it can be a conventional collar fig1 depicts an illumination facility 1700 for use in interaction with an application of a chemical 1702 light from the illumination facility 1700 can be provided in any color of the spectrum under control of a processor 104 thus the light can interact with the chemical 1702 to create an effect for example a chemical can include a luminescent portion that lights under light of a given spectrum such a luminescent facility could be used to confirm with an illumination facility 1700 that a chemical has been applied over all of a given surface such as a surface covered with insect repellant a deck sealer or a suntan lotion fig1 depicts an appliance 1800 with an illumination facility the appliance 1800 may be an oven microwave oven refrigerator washer dryer toaster or other appliance the light system 100 can be used to light the appliance 1800 or an interior or exterior environment of or about the appliance 1800 the light system 100 can be coupled with a sensor to sense an environmental condition and to display illumination that indicates the condition for example an oven can light in a red color if it is hot sensor and feedback applications are described more particularly in certain patents and patent applications incorporated by reference herein in yet another embodiment of the present invention an illumination system is disposed in combination with a scent producing facility together with a processor or processors this combination allows simultaneous or coordinated production of controlled scent and illumination in embodiments.