Holiday Lighting Outlet C7 Christmas Light String, Patio Event Lighting, 100', White Cord, 12" Socket Spacing, E12 Professional sockets feature weep holes for trouble free damp weather performance. Popular 12" spacing between sockets Compatible with LED or incandescent bulbs with E12 Candelabra (12mm) bases. Use with E12 base bulbs including C7 and G30. Bulbs sold separately. SPT1 insulation provides 7 amp capacity. UL Recognized Components, rated for Indoor / Outdoor use. Max Run is 170 Sockets (212 Feet) with 7 Watt Incandescent Bulbs or 340 Sockets (425 Feet) with 1 Watt LED Bulbs Calculate for Amp Needs: # of Bulbs x Watts/Bulb = Total Watts Total Watts / 120 volts = Amp Needs