RF Filter Set - Case of 6Case of 6 The RF Filter set is a product of necessity. Over the past year the FCC has come down hard on electronic ballast manufacturers. Until recently electronic ballasts received little attention. However, as more and more gardeners switch to electronic ballasts, the FCC has started to take notice when it comes to both emitted and conducted radio frequency interference aka RFI. The more electronic ballasts that are in operation the greater the