each bulb is mounted to the inside surface of the top shell half by a bracket secured to the surface itself by ether bolts screws rivets glue or epoxy the bulbs are situated along the sides of the top shell half at a distance of one to thirty six inches from the bottom edge of the side surface and at any point along the length of the side the bulbs 100 are controlled by either a computer chip or a timing circuit the control unit or chip 203 receives a signal from an external sensor 101 such as a contact sensor or proximity sensor this system also operates as a dead man switch that is to say when the top shell half is opened the sensor sends a signal to a control circuit that tells the system to turn off the bulbs this feature is a safety feature designed to prevent direct human contact with the uvc light being emitted within the housing shell body the purpose of the shell to shell hinges 23 within the design assembly is to attach both the top and bottom shell halves to one another the hinge or set of hinges permits the top shell half to fold open or closed in relation to the bottom shell half the hinges themselves may be made of any durable rust resistant material such as stainless steel or any hard plastic the hinges are located along the edge of each shell 39.