i bought these (
http://cgi.ebay.com/ebaymotors/ws/eBayI ... 0512758069) in december, but its been too cold to install outside.
ebay seller hdcautosports
they have a switch, and you can control both the halo and the bulb separately (so the seller claims). I'm not expecting much from these being they were cheap.
a several members have had mixed reviews on ebay fogs in general. For some, they've lasted and work good, but others have had them burn out after 1 month or so.
If anything, i'm sure you can replace the bulbs and what not if that were to occur.