UV light monitoring system for a UV decontamination apparatus

A system for disinfecting a space, comprising:

• a system comprising a UV light monitor including a UV sensor, and a controller including a processor operable to respond to computer-readable instructions stored in a memory to:
• calculate a UV irradiance on a target surface that is remote from the UV light monitor based on:
• UV light intensity measurements made by the UV light monitor, a first angle between the UV sensor and UV light that is generated by a UV emitter and is incident on the UV sensor;
• a second angle between the target surface and UV light generated by the UV emitter that is incident on the target surface;
• a distance between the UV emitter and the UV sensor;
• and a distance between the UV emitter and the target surface, and
• determine a disinfection cycle time for the target surface based on the calculated UV irradiance;
• the system for disinfecting a space further comprising;
• a UV emitter, wherein the controller is operable to respond to computer-readable instructions stored in the memory that cause the UV emitter to expose the target surface to UV light for a duration equal to the disinfection cycle time.