I am relocating and installing 6 lamp t-8 fixtures in a warehouse , i am also installing motion sensors in the new lights and em ballasts ; the existing have motion sensors already. the problem i"m having is when I install the em ballast with the motion sensor I get a blinking on off every few seconds. I checked the time delay and any close by air ducts as recommended by the instructions and still have the problem This only happens with the em ballast. I dont have the product numbers , the em ballsts are begahlli and leviton for the motion sensor.:? It happened with two I have done with the new oracle lights and one existing fixture , . This did happen on the first 2 new fixtures I did, a little frustatig all wiring checked out and i removed the lamps that are wired with the em ballast and the other three lamps worked fine.