The RF Filter set is a product of necessity. Until recently electronic ballasts received little attention. However, as 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 disruption. Most electronic ballasts pre-2014 did not meet FCC requirements. The RF Filter set brings older electronic ballasts close or into full FCC compliance.