The present invention disinfects countertop surfaces using high intensity ultraviolet energy causing photolysis. The light is directed to the working area of an office countertop or the countertop used in food preparation such as in a residential or commercial kitchen. A motion detector provides a mechanism for disabling the light should a pet or individual enter an area during the disinfection process. The device further includes a fluorescent lamp allowing dual functionality wherein the device can provide conventional countertop lighting or disinfection lighting.