The Halo LED housings I've bought are just like the the standard "edison" screw in housings, except instead of an edison socket, they come wired with an orange LED retrofit flushmount connector. The housings cost around $10 each at Home Depot, and retrofit LED bulbs can be bought at Costco for about $5 each with a SCE subsidy. The flushmount bulbs are wired with an orange connector compatible with the LED housings, and also have a pigtail adapter that can be used with an edison socket. At this point in time edison sockets are more common and might be a safer bet for future compatibility, but I think the LED connectors are here to stay, and with the housings being cheaper, I chose to take a risk on them.