I already ran wires to a trailer I was doing but wasn't happy with the wires I used so I tore them out and used these CZC trailer lights. The only thing I used of my own was water-resistant connectors I have since it did not have enough on its own but either was not a big deal to have to go buy a couple of connectors if it's how you want to do it. Great quality and very impressed
 
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Some newish vehicles (last 10 years) have an option in main ECU to specify if regular or LED bulbs are fitted ? Only ever seen it on one car, but cannot remember for sure. I think it was my dad's Ford Focus ?
 

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