Safety Tip on Holiday Lights
Mixing LED lights and incandescent light strings on the same circuit is not recommended. They operate at very different current levels and if they run in a series, it will ruin the LEDs. You can run them off the same power cord if you use a multi-head connector, so that each string is connected directly into the extension cord. Also, be aware of running too many light strings on a single extension cord. Look for the maximum wattage limit on your extension cord and add up the watts for each string you connect to that cord to be sure you are not exceeding the limit.