Novelty Lights C9 LED Filament Retrofit replacement lamps, utilize a 1 LED filament design for veiwing from all angles. Switch out those old incandescent C9 bulbs that consume too much energy and break all the time, for our energy efficient Retro-fit C9's utilizing LED filament technology. All of our LED C9's are energy efficient using only 1 Watt and 0.008 Amps. Built to last with a 2 season warranty. Our C9 filament LED bulbs will provide years of quality use. Our LED C9 filament bulbs can be used with our C9 stringers (100', 25', 12.5' & 10'), as well as our commercial grade C9 Bulk Spools and our Vintage Twisted Wire Strings with E17 Bakelite Sockets.