I haven't hung them yet. I have a Y-connector to put two bulbs on one plug with a lamp-socket to plug-in connector which will then be suspended from an extension cord. I plan on using zip ties to keep the connectors attached to the extension cord so it doesn't pull the plug out.

The bulbs have a standard lamp style screw in connector like a normal household bulb.

I ordered this and here is the cord and adapter with a switch. I doubt all four of these giants will fit in that one 4-way adapter but I will find out tonight when it arrives.