I have an issue at a customers residence. About a month ago we installed 6 T8 4 lamp 8' open strip fixtures in his garage. At the time everything worked fine. Two weeks later ADT came and installed a security system. Since that time, whenever the customer turns on the garage lights the central vacuum system in the garage turns on for a brief second and then everything works fine. The only time it happens is when the lights in the garage turn on, could this be an issue with harmonics and if so what would be a common fix for it? I never seen anything like this before. Thank you in advance for your help.