Longer Life Bulb/Heating Element (500 watt) EdenPURE GEN4 & USA1000 Infrared Heaters 10%-25% Longer Life than OEM Sylvania Bulb/Heating Element Longer life and yet lower price than a set of OEM bulb! Compatible with EdenPURE GEN4 USA1000 US1000 Personal Heater Space Saver USA1000A4188/RTL A4428/RTL GEN4A4643/RTL PersonalA4887/RTL and more!